Archive

Aug. 2003: the layout of the page has been changed. In addition, several changes and improvements have been made. Details are given below.

• Jun. 2023: HMgC₃N; NaC₃N; CH₃NHCH₃; HSO; CCl⁺; C³⁷Cl⁺; ¹³CCl⁺.
• May 2023: MgC₆H⁺; MgC₅N⁺.
• Apr. 2023: c-CD₂CH₂O; MgC₄H⁺; MgC₃N⁺.
• Mar. 2023: C₆H₅C₃N; 1-CN-4-CCH-C₆H₄; 1-CN-2-CCH-C₆H₄; 1-CN-3-CCH-C₆H₄.
• Feb. 2023: OH, v = 0; OH, v = 1; OH, v = 2; C₇N⁻; C₁₂H; C₁₀H⁻.
• Feb. 2023: Adjusted Q values and g_up of excited state HC₅N entries and the IR band to be compatible with version 2 of v = 0.
• Jan. 2023: MgC¹³C; urea, v = 0; urea, v₁; urea, v₂ & v₃; urea, v₄ & v₅.
• Dec. 2022: DCS; H¹³CS; ethynylbutatrienylidene, NC₄NH⁺; MgC₂; ²⁶MgC₂; ²⁵MgC₂.
• Nov. 2022: HC₄S; DSC; HS¹³C.
• Oct. 2022: t-C₂H₃NCO; cis-C₂H₃NCO; g'Gg'-alaninol; gG'g-alaninol; 2-hydroxypropenal.
• Sep. 2022: ¹³CH₃OCH₃; 2-Iminopropanenitrile; c-C₂H₃DO.
• Aug. 2022: E-1-propanimine; Z-1-propanimine; Z-propynimine; E-propynimine; HC(O)OCH₂D; HC(O)OCHD₂; DC(O)OCH₃; ¹³CH₃C(O)CH₃; corrected intensities of SiS, v ≤ 19 and Si³³S, v ≤ 9.
• Jul. 2022: Ethenylidenecyclopentadiene; ethynylcyclopropynylidyne; allenyldiacetylene; heptatetraen-6-yne; allenylcyanoacetylene.
• Jun. 2022: H₂¹³CC₂S; HDC₃S; H₂C₃³⁴S.
• May 2022: H₂C¹³CS; H₂¹³CCS; H₂CC³⁴S; HDC₂S; H₂C₃S; H₂C₂¹³CS; H₂C¹³CCS.
• Apr. 2022: syn-C₂H₃C(O)NH₂, v = 0; syn-C₂H₃C(O)NH₂, v₂₄ = 1.
• Mar. 2022: c-C₂H₄O; c-C¹³CH₄O; c-C₂H₄¹⁸O; CD₃OH, v_t = 0; CD₃OH, v_t = 1; CHD₂OH, v_t = 0; HCCNCH⁺; HC₇NH⁺.
• Feb. 2022: MgS, v = 0, 1; ²⁵MgS, v = 0; ²⁶MgS, v = 0; Mg³⁴S, v = 0; MgO, v = 0 − 2; ²⁵MgO, v = 0, 1; ²⁶MgO, v = 0, 1.
• Jan. 2022: H₂CCNH; ⁴⁷TiO, v = 0; ⁴⁷TiO, v = 1; ⁴⁷TiO, v = 2; ⁴⁷TiO, v = 3; glycinamide; ⁴⁹TiO, v = 0; ⁴⁹TiO, v = 1; ⁴⁹TiO, v = 2; ⁴⁹TiO, v = 3.
• Dec. 2021: s-cis-H₂C=CHCOOH; s-trans-H₂C=CHCOOH; 1,3-c-C₆H₈; c-C₅H₆-¹³C₁; c-C₅H₆-¹³C₂; c-C₅H₆-¹³C₅; c-C₅H₆-D₁; c-C₅H₆-D₂; c-C₅H₆-D₅; HC₃HCN; HCCS⁺.
• Nov. 2021: fulvene; benzvalene; dewar benzene; dimethylenecyclobutene; norbornadiene; 3-methylene-1,4-cyclohexadiene; spiro[2.4]hepta-4,6-diene; c-C₅H₄O; ethylidenecyclopentadiene.
• Oct. 2021: NCCNO; azulene; azenaphthene; CCD; azenaphthylene; fluorene.
• Sep. 2021: anti-CH₂CCHCH₂CN; syn-CH₂CCHCH₂CN; MgC₅N; H₂NC; MgC₆H.
• Aug. 2021: Z-CH₂(CH)₃CN; E-CH₂(CH)₃CN.
• Jul. 2021: HC(S)CN; HC(³⁴S)CN.
• Jun. 2021: CH₂(OH)CHO, v = 0; CH₂(OH)CHO, v₁₈ = 1; CH₂(OH)CHO, v₁₂ = 1; CH₂(OH)CHO, v₁₇ = 1; CaH⁺; CH₂DCCD; CHD₂CCH; l-C₅H₂; H₂C₃HCCH; l-C₈H₂; CH₂DC₃N; HC₂CHS.
• May 2021: ⁴⁴TiO, v = 0; ⁴⁴TiO, v = 1; H₂CNOH; indene; c-C₅H₆; c-C₃HCCH.
• Apr. 2021: ⁵⁰TiO, v = 0; ⁵⁰TiO, v = 1; ⁵⁰TiO, v = 2; ⁵⁰TiO, v = 3; Ti¹⁸O, v = 0; Ti¹⁸O, v = 1; Ti¹⁸O, v = 2; Ti¹⁸O, v = 3.
• Mar. 2021: TiO, v = 0; TiO, v = 1; TiO, v = 2; TiO, v = 3; TiO, v = 4; TiO, v = 5; ⁴⁶TiO, v = 0; ⁴⁶TiO, v = 1; ⁴⁶TiO, v = 2; ⁴⁶TiO, v = 3.
• Feb. 2021: c-H₂C₃O; c-HDC₃O; c-H₂C₂¹³CO; c-H₂¹³CCCO; c-H₂C₃¹⁸O; c-D₂C₃O; H₂C(CCH)₂; HC₃S⁺.
• Dec. 2020: HOCH₂C(O)NH₂; NH₃, v = 0 with HFS; CH₂OH.
• Oct. 2020: HC₄NC; HC₆NC; HC(S)NH₂; HC₃O⁺; aminoacetonitrile, v = 0; aminoacetonitrile, v₁₁ + v₁₈ = 1; aminoacetonitrile, v₁₇ = 1; butadiynyliminomethylium.
• Sep. 2020: CH₂D³⁷Cl; HCCCH₂CN; CH₃ONH₂.
• Aug. 2020: HC₇N, v = 0; HC₅N, v = 0; CH₃OCH₂OH; CH₃OCN; C₂H₅NCO; CH₂DCl.
• July 2020: CD₃CN; CH₃¹³CHO, v_t ≤ 1; ¹³CH₃CHO, v_t ≤ 1; HC₉N, v = 0; DC₉N; H¹³CC₈N; HC¹³CC₇N; HC₂¹³CC₆N; HC₃¹³CC₅N; HC₄¹³CC₄N; HC₅¹³CC₃N; HC₆¹³CC₂N; HC₇¹³CCN; HC₈¹³CN; HC₉¹⁵N.
• June 2020: NCHCCO.
• May 2020: CH₃SH, v_t ≤ 2; ¹⁸O; CH₃SD, v_t ≤ 2; CH₃³⁴SH, v_t ≤ 2; ¹³CH₃SH, v_t ≤ 2.
• Apr. 2020: 3-Aminopropionitrile, conf. I; 3-aminopropionitrile, conf. II; CH₃C¹³CH; CH₃¹³CCH; ¹³CH₃CCH; CH₃¹³C¹³CH; ¹³CH₃C¹³CH; ¹³CH₃¹³CCH; CH₃CCD; CH₃C¹³CD; CH₃¹³CCD; ¹³CH₃CCD; CH₂DC¹³CH; CH₂D¹³CCH; ¹³CH₂DCCH; the old ¹³CH₃OH entry is now available with intensities at 300 K, as is generally the case.
• Mar. 2020: C₄D; ¹³CCCCH; C¹³CCCH; CC¹³CCH; CCC¹³CH.
• Feb. 2020: O¹⁸O; ¹⁸O₂; O₂, a ¹Δ; C₄H, v = 0; C₄H, v₇ = 1; C₄H, v₇ = 2⁰; C₄H, v₇ = 2²; C₄H, v₆ = 1; C₄H, v₅ = 1; C₄H, v₆ = v₇ = 1.
• Jan. 2020: ²⁶AlO, v = 0; ²⁶AlO, v = 1 − 2; O₂, X ³Σ, v = 0.
• Dec. 2019: Aminomethylium; AlO, v = 0; AlO, v = 1 − 2; AlO, v = 3 − 5; Al¹⁸O, v = 0; Al¹⁸O, v = 1 − 2; Al¹⁷O, v = 0; Al¹⁷O, v = 1 − 2.
• Nov. 2019: Si³³S, v = 0 − 9.
• Oct. 2019: PO, v = 0; PO, v = 1, 2; PO, v = 3 − 5; MgC₃N; MgC₄H; CH₃CHOHCHO; SiS, v = 0 − 20; ²⁹SiS, v = 0 − 12; ³⁰SiS, v = 0 − 12; Si³⁴S, v = 0 − 12.
• Sep. 2019: syn-vinyl alcohol; anti-vinyl alcohol; propargylamine; PN, v = 0 − 5.
• July 2019: AlCl, v = 0 − 10; Al³⁷Cl, v = 0 − 10; ²⁶AlCl, v = 0 − 2; ²⁶Al³⁷Cl, v = 0 − 2; Al³⁶Cl, v = 0 − 2.
• June 2019: HCCO; DCCO; NaCl, v = 0 − 15; Na³⁷Cl, v = 0 − 15; Na³⁶Cl, v = 0 − 5.
• May 2019: K³⁷Cl, v = 0 − 15; ⁴¹KCl, v = 0 − 15; ⁴¹K³⁷Cl, v = 0 − 15; ⁴⁰KCl, v = 0 − 5; ⁴⁰K³⁷Cl, v = 0 − 5; K³⁶Cl, v = 0 − 5; ⁴¹K³⁶Cl, v = 0 − 5; HCCSH; CH₃COOH, v_t = 0; CH₃COOH, v_t = 1; CH₃COOH, v_t = 2; CH₃COOH, Δv_t ≠ 0; corrected partition function values and rotational parameters in the propene documentation.
• Apr. 2019: syn-C₂H₃SH; anti-C₂H₃SH; CH₃CDO, v_t = 0, 1; CH₂DCHO, v_t = 0; TiF; KCl, v = 0 − 15.
• Mar. 2019: H₂N¹³CN; H₂¹⁵NCN; H₂NC¹⁵N; FeN; CrO; CrN; CrF; CrCl; Cr³⁷Cl; CrH.
• Mar. 2019: Updated CDMS links in several arXiv versions of manuscripts and made some available newly. The same applies to the Cologne Stectroscopy Data section.
• Feb. 2019: FeO Ω = 4; FeO Ω = 3; FeO Ω = 2; ⁵⁴FeO Ω = 4; ⁵⁴FeO Ω = 3; ⁵⁴FeO Ω = 2.
• Jan. 2019: AlF, v = 0 − 5; ²⁶AlF, v = 0 − 2; p-c-SiC₃; HSCO⁺; DSCO⁺.
• Dec. 2018: HFS data for H₂CO were extended to include R-branch transitions with J up to 5 and K_a = 1.
• Nov. 2018: E-HNCHCN; Z-HNCHCN; cyanooxirane; HCCCH₂CN; CH₃OCH₂CHO.
• Oct./Nov. 2018: Several outdated links were corrected.
• Oct. 2018: c-C₆H₅CCH; H₂NNC.
• Sep. 2018: Corrected K_a designation of E levels of methanol; “≤” now reads “≥” and “>” now reads “<”.
• Aug. 2018: 3-methylanti- and -gauchebutyronitrile; CH₃NC; NaS; KS; ¹⁵NH; CH₃D; the CH₃CNO entry is available with separated A₁ / A₂ lines.
• July 2018: i-C₃H₇¹³CN; (CH₃)₂¹³CHCN; ¹³CH₃(CH₃)CHCN; AlSH; NaSH; MgSH; CaSH; KSH.
• June 2018: corrected files with HFS for isotopic CH₃CN in v₈ = 1.
• May 2018: C₂H₅NC.
• Apr. 2018: g-i-C₃H₇OH; a-i-C₃H₇OH; AlC₂; trans-HC(S)SH; cis-HC(S)SH.
• Mar. 2018: H₂C₄S; H₂C₅S; DCCCHO; HCCCDO; HCC¹³CHO; HC¹³CCHO; H¹³CCCHO; corrected tags of pentadiynal and heptatriynal; corrected files without HFS for isotopic CH₃CN in v₈ = 1.
• Feb. 2018: DS₂; pentadiynal; heptatriynal; propynethial; pentadiynethial; NS⁺; HC₄S; HC₅S; HC₇S; CHD₂⁺.
• Jan. 2018: HD₂⁺; HDNCN; HCCS; HC₃S; H₂C₄O; s-propanal, v = 0; s-propanal, v₂₄ = 1; s-propanal, v₂₃ = 1; g-propanal, v = 0; C₆S; C₉S; created hyperfine predictions for benzonitrile; the CH₃CN files with HFS have been corrected as well.
• Dec. 2017: HC¹⁵N, v = 0; HC¹⁵N, v₂ = 1; HC¹⁵N, v₂ = 2; HC¹⁵N, v₂ = 3; HC¹⁵N, v₃ = 1; HC¹⁵N, v₁ = 1; the standard entry of CH₂OH is available with 6 quantum numbers; the standard CH₃CN entries (without HFS) have been corrected.
• Nov. 2017: HNC₃.
• Oct. 2017: SiH⁺, v = 0; SiH⁺, v = 1 − 0; urea; SH⁺; ³⁴SH⁺.
• Sep. 2017: H₂CSiH₂; H₂CSi; c-H₂C₂Si; H₂C₂Si; 2-Cyano-anti-butane.
• Aug. 2017: ¹⁵N₂H⁺; ¹⁵N₂D⁺; HC₄O; HC₅O; HC₆O; HC₇O; H₂NCH₂CN, v₁₁ + v₁₈ = 1; H₂NCH₂CN, v₁₇ = 1; a new compilation is available for CH₃OH, v_t = 0 − 2.
• July 2017: DOCO⁺; HOCO⁺; HO¹³CO⁺; separate para and ortho predictions with ¹⁴N hyperfine splitting are available for NH₂D.
• May 2017: g'Ga-1,2-propanediol; gG'g'-1,2-propanediol; aGg'-1,2-propanediol; g'Gg-1,2-propanediol; added separate para and ortho predictions for H₂CO.
• Apr. 2017: i-C₃H₇CN, v₃₀ = 1; H₂NCH₂¹³CN; H₂N¹³CH₂CN; G'Gg'gg'-glycerol; GGag'g'-glycerol; benzaldehyde; anisole; ¹³CH₃¹³CH₂¹³CN.
• Mar. 2017: 1-butyne; H₂D⁺; CH₂OH; HOCH₂CN; corrected intensities of CH₃O¹³CHO which were too low by a factor of 2.
• Feb. 2017: H₂C¹⁷O; H₂C¹⁸O; H₂CO; H₂O⁺; i-C₃H₇¹³CN; (CH₃)₂¹³CHCN; ¹³CH₃(CH₃)CHCN.
• Jan. 2017: NO⁺, v = 0, 1; C₂H₃D; CH₃OCN; vinyl formate; propene.
• Dec. 2016: n-C₃H₇CN, v = 0; g-n-C₃H₇CN, v₃₀ = 1; a-n-C₃H₇CN, v₃₀ = 1; g-n-C₃H₇CN, v₂₉ = 1; a-n-C₃H₇CN, v₁₈ = 1; g-n-C₃H₇CN, v₃₀ = 2; a-n-C₃H₇CN, v₃₀ = 2; g-n-C₃H₇CN, v₂₈ = 1; a-n-C₃H₇CN, v₂₉ = 1.
• Nov. 2016: C₂H₅OH, v = 0; CH₃CN, v = 0; CH₃CN, v₈ = 1; CH₃CN, v₈ = 2; CH₃CN, v₈; CH₃CN, 2v₈ − v₈; CH₃CN, 2v₈.
• Oct. 2016: ScO; oxetane; diketene; C₂H₅CN, v₂₀ = 1-A; C₂H₅CN, v₁₂ = 1-A.
• Sep. 2016: CH₃CNO; CH₂D⁺.
• Aug. 2016: CH₃C¹⁵N, v₈ = 1; carbonyl cyanide; DNCS, a-type; DNCS, b-type; HNC³⁴S, a-type; HN¹³CS, a-type; H¹⁵NCS, a-type; H³⁴SCN; HS¹³CN; DSCN; HSC¹⁵N; HCNS; HSNC.
• July 2016: HSO; ¹³CH₃CN, v₈ = 1; CH₃¹³CN, v₈ = 1; imported CH₃SH from VAMDC version of CDMS; extended HFS predictions of CH₃¹³CN and of ¹³CH₃CN; modified tag of ³⁰Si¹⁸O which was in conflict with that of CH₃SH.
• June 2016: HON₂⁺; HN₂O⁺; propylene oxide.
• May 2016: HSCH₂CN; ¹⁵NH₂; CrC.
• Apr. 2016: CH₃¹³CH₂¹³CN; ¹³CH₃CH₂¹³CN; ¹³CH₃¹³CH₂CN; t-C₄H₉CN.
• Mar. 2016: CH₃NCO, v_b = 0; CH₃NCO, v_b = 1.
• Feb. 2016: cis-C₂H₂O₂; 3-hydroxypropenal.
• Jan. 2016: OH⁺; HD¹³CO; HDC¹⁸O; HDCO; D₂CO; D₂¹³CO; D₂C¹⁸O.
• Dec. 2015: 3 c-C₃HD isotopologs with ¹³C.
• Nov. 2015: trans-Propenal; l-C₃HD.
• Oct. 2015: SiC₂, v₃ = 1; SiC₂, v₃ = 2; SiC₂, v₃ = 3 (extrapolation); SiC₂, v₃ = 4 (extrapolation).
• Sep. 2015: gauche-C₂H₅SH; gauche-C₂H₅³⁴SH; anti-C₂H₅SH.
• Aug. 2015: a-CH₃CH₂OD; a-CH₃CHDOH; a-a-CH₂DCH₂OH; a-s-CH₂DCH₂OH; CH₂(OD)CHO; CHD(OH)CHO; CH₂(OH)CDO; corrected intensities in N₂D⁺ entry without HFS.
• July 2015: NCCNH⁺; NCCND⁺; NC¹³CNH⁺; N¹³CCNH⁺; CH₂CHCNH⁺; HCCNSi; NCNSi.
• June 2015: H₂PCN; Si₂C, v = 0; PCN; CH.
• May 2015: C₅H; C₄¹³CH; C₃¹³CCH; C₂¹³CC₂H; C¹³CC₃H; ¹³CC₄H; C₅D; CH₃O¹³CHO, v_t = 0, 1; imported dimethyl ether entry with corrected K quanta.
• Mar. 2015: SH, v = 0; SH, v = 1; C₃H⁺; added two ground-state HFS components each to entries of H₂Cl⁺ and H₂³⁷Cl⁺.
• Feb. 2015: C₅S; C₅³⁴S; ¹³CC₄S; C¹³CC₃S; C₂¹³CC₂S; C₃¹³CCS; C₄¹³CS; C₇S; imported CH₃¹⁸OH entry.
• Jan. 2015: NO, v = 0; NO, v = 1; ¹⁵NO; N¹⁸O; N¹⁷O; ¹⁵N¹⁸O; ¹⁵N¹⁷O; Ga-n-C₃H₇OH.
• Dec. 2014: H₂S₂; SiC₃H; SiC₂N; SiC₄H; SiC₃N; cis-S₂O₂; added comment on dipole moment of SiCCH.
• Nov. 2014: H¹³CN, v = 0; H¹³CN, v₂ = 1; H¹³CN, v₂ = 2; H¹³CN, v₂ = 3; H¹³CN, v₃ = 1; H¹³CN, v₁ = 1; C₂N; relegated 3rd N₂H⁺ entry to the archive; the 4th entry is now the only one in the catalog.
• Oct. 2014: AlC₃N.
• Sep. 2014: SiH₃CN; SiH₃¹³CN; ²⁹SiH₃CN; ³⁰SiH₃CN; SiH₃CCH; OH⁻; SH⁺.
• Aug. 2014: aG'g-propanediol; gG'a-propanediol; g'G'g-propanediol; added comment on reported J = 2 − 1 transition frequency of AlH in the documentation.
• Jul. 2014: provided missing DNC files.
• Jun. 2014: Pyridine; Furan; Pyrrole.
• May 2014: Glyceraldehyde; l-C₃D₂; H₂CNH; H₂¹³CNH; H₂CND; H₂C¹⁵NH; n-C₃H₇CN; o-c-SiC₃; renamed c-SiC₃ p-c-SiC₃.
• Apr. 2014: N₂H⁺, v = 0; previous entry will be kept temporarily as alternative entry; HNSi; dibridged Si₂H₂; monobridged Si₂H₂; trans-HC(O)SH; cis-HC(O)SH.
• Mar. 2014: a'GG'g-1,3-Propanediol; gGG'g-1,3-propanediol; C₄N.
• Feb. 2014: ²⁹Si¹⁷O, v = 0 − 2, ³⁰Si¹⁷O, v = 0 − 2; E-HNCHCN; Z-HNCHCN; H₂CNCN; C₃H⁺.
• Jan. 2014: SiO, v = 0 − 10; ²⁹SiO, v = 0 − 6; ³⁰SiO, v = 0 − 6; Si¹⁸O, v = 0 − 5; Si¹⁷O, v = 0 − 4; ²⁹Si¹⁸O, v = 0 − 3; ³⁰Si¹⁸O, v = 0 − 3.
• Dec. 2013: H₂NCH₂CN; HDNCH₂CN; D₂NCH₂CN; s-cis-H₂C=CHCOOH; s-trans-H₂C=CHCOOH; ³⁸ArH⁺; added isotope explanations to all ArH⁺ isotopologs; corrected slight errors in S atom entry.
• Nov. 2013: H₂NCO⁺; methyleneaminoacetonitrile; MgOH; CaOH.
• Oct. 2013: Propadienonethione; CH₂D⁺; trans-HOCO; cis-HOCO; corrected minor frequency issues in the data for ethanol with one ¹³C.
• Sep. 2013: c-C₂H₄S; HMgNC; HSiCN; HSiNC; NH₃D⁺; c-C₆H₅OH.
• Aug. 2013: CO⁺, v = 0; CO⁺, v = 1; ¹³CO⁺; C¹⁸O⁺; ¹³C¹⁸O⁺.
• July 2013: CH₂DCN; CHD₂CN.
• June 2013: C₃S, v = 0; C₃³⁴S; ¹³CCCS; C¹³CCS; CC¹³CS; C¹³C¹³CS; ¹³CC¹³CS; CC¹³C³⁴S; C¹³CC³⁴S, ¹³CCC³⁴S; C₃S, v₅ = 1.
• May 2013: PH₃; TiO; reevaluated HN¹³C.
• Apr. 2013: malononitrile; formamide, v = 0; formamide, v₁₂ = 1; H¹³C(O)NH₂; DC(O)NH₂; reevaluated CH₃C₈H, CH₃C₇N, and CH₃C₉N; corrected partition function in HC(¹⁸O)NH₂ documentation.
• Feb. 2013: CH₂(OH)¹³CHO; ¹³CH₂(OH)CHO; C₂H₅¹³CN; CH₃¹³CH₂CN; ¹³CH₃CH₂CN; lowered intensity cut-offs for PH₃ entry.
• Jan. 2013: C₂H₅NH₂, anti-conformer.
• Dec. 2012: HSiS; HSiO.
• Nov. 2012: H₂F⁺; H₂SiO; H₂SiS; C₃H⁺.
• Oct. 2012: corrected spin-statistics for c-C₂H₄O and c-C₂H₄¹⁸O; some links and references have been corrected.
• Sep. 2012: YO; AlS; AlCCH; ScS; YS; HSO.
• Aug. 2012: a-CH₃¹³CH₂OH; a-¹³CH₃CH₂OH.
• July 2012: c-C₃D₂; HCCO; HNCN; H₂CNH; c-C₂H₄O; c-C¹³CH₄O; c-C₂H₄¹⁸O; corrected ¹³C⁺ and ³⁶ArH⁺ entries.
• June 2012: c-C₃HD; c-¹³CC₂H₂; c-CC¹³CH₂.
• May 2012: c-C₃H₂; H₂O⁺; OD⁺; ¹⁸OH⁺.
• Apr. 2012: HC₅N, v₁₁ = 5; HC₃N, v₄ = 1; HC₃N, v₇ = 4 / v₅ = v₇ = 1; HC₃N, v₆ = 2; corrected and applied transition dipole moment for HCCCN, v₁ band.
• Mar. 2012: AA-n-C₄H₉CN, GA-n-C₄H₉CN, AG-n-C₄H₉CN, HC₅N, v₁₀ = v₁₁ = 1; modified state description of v₆ = v₇ = 1 for HCCCN as well as its isotopologs with one ¹³C.
• Feb. 2012: H₂D⁺; HD₂⁺; 2-Aminopropionitrile; extended J range for SiO, v = 0 − 6; ²⁹SiO, v = 0 − 3; ³⁰SiO, v = 0 − 3; Si¹⁸O, v = 0 − 3.
• Jan. 2012: NaCN; Na¹³CN; HCCN; H¹³CCN; HC¹³CN; DCCN; HCC¹⁵N; reevaluated <strong>c</strong>-H₂C₃O entry; omitted redundant quantum numbers in ¹⁵N³⁴S entry; corrected code for QNFMT in entries for TiS isotopologs.
• Dec. 2011: SiC₂, v = 0; ²⁹SiC₂; ³⁰SiC₂; HD; H₂N¹³CN; HCCCN, v₃ band; HCCCN, v₂ band; HCCCN, v₁ band; added separate para and ortho entries as well as ortho hyperfine entries for H₂CCO and H₂CS; updated old D₂CO entry which supposedly had been updated long time ago; corrected frequency of the F = 2 − 1 component of ¹³C⁺.
• Nov. 2011: ¹⁵NH₃; HCCCN, v₆ = v₇ = 1; H¹³CCCN, v₆ = v₇ = 1; HC¹³CCN, v₆ = v₇ = 1; HCC¹³CN, v₆ = v₇ = 1; HCC¹³CN, v₄ = 1; HCC¹³CN, v₄ = v₇ = 1.
• Oct. 2011: NaCCH; CaCCH; KCCH; LiCCH; corrected ab initio dipole moment of MgCCH.
• Sep. 2011: cis-HOSO⁺; HSCO⁺; HOCS⁺; C₂Cl; C₂³⁷Cl; C₃F; C₃Cl; c-C₃HCN; C₂H₃C₃N; (E)-HC₂CHCHCN; (Z)-HC₂CHCHCN.
• Aug. 2011: NS, v = 0; NS, v = 1; NS, v = 1 − 0 IR band; N³⁴S; N³³S; ¹⁵NS; ¹⁵N³⁴S; N³⁶S; separate ortho and para entries are available for H₂S isotopologs.
• July 2011: c-C₃H₅CN; NCO⁻; OSiS.
• June 2011: TiO₂; ⁴⁶TiO₂; ⁵⁰TiO₂.
• May 2011: D₂O; NHD₂; CH₂DCN; CHD₂CN.
• Apr. 2011: extended frequency range for hyperfine predictions of HCN, v = 0.
• Mar. 2011: gG'a-1,2-propanediol; g'G'g-1,2-propanediol; c-C₃H₂; renamed 1,2-propanediol aG'g-1,2-propanediol.
• Feb. 2011: NaCl, v = 0 − 4; glycolic acid; glyoxylic acid; i-C₃H₇CN.
• Jan. 2011: KCl, v = 0 − 4.
• Dec. 2010: SiH.
• Nov. 2010: N₂H⁺, v₂; TiS; ⁴⁶TiS; ⁵⁰TiS.
• Sep. 2010: HCO⁺, v₂.
• Aug. 2010: C⁺; ¹³C⁺; O atom; N⁺; Si atom; S atom; Si⁺; Al atom; Fe atom; Fe⁺; SiC₂.
• Aug. 2010: adjusted dipole moments for CCH to old value which turned out to be better; entries for minor isotopologs of CCH may have more lines.
• July 2010: CCH, v = 0; CCH, v₂ = 1; CCH, v₂ = 2; CCH, v₃ = 1; CCH, v₂ FIR band; CCH, v₃ IR band; CCH, v₂ + v₃ IR band; CCH, 5v₂ IR band.
• June 2010: H₂DO⁺; CH₂D⁺; CH₃OCH₃, v = 0.
• May 2010: CH⁺, v = 1 − 0; CH⁺, v = 2 − 0; ¹³CH⁺, v = 1 − 0; CD⁺, v = 1 − 0.
• May 2010: Started to provide separate entries for para and ortho spin modifications along with separate partition function values: H₂Cl⁺; H₂³⁷Cl⁺; D₂O.
• Apr. 2010: H₂³⁷Cl⁺; CH⁺; ¹³CH⁺; CD⁺; ¹³CD⁺; ¹⁴CH⁺; CT⁺.
• Mar. 2010: corrected the tag for H₂Cl⁺.
• Feb. 2010: CF⁺, v = 0, 1; ¹³CF⁺, v = 0, 1; O₂, a ¹Δ; CaO, v = 0, 1; CaS, v = 0, 1.
• Jan. 2010: O₂, X ³Σ⁻, v = 0; O¹⁸O; ¹⁸O₂; C₃N⁻; C¹³CH.
• Dec. 2009: AlH; CH₃CN, v = 0; ¹³CH₃CN, v = 0; CH₃¹³CN, v = 0; CH₃C¹⁵N, v = 0; CH₂DCN; ¹³CH₃¹³CN.
• Nov. 2009: Benzonitrile (c-C₆H₅CN); HONC; 1,2-Propanediol; HSCN; H₂Cl⁺.
• Oct. 2009: C₂H₃⁺; CH₃CP.
• Sep. 2009: LiOH; DCO⁺; DNC; HN¹³C.
• Aug. 2009: BO; ¹⁰BO; CCH, v = 0; aa-diethyl ether; C₂H₅CN, v = 0; NaOH; KOH; ⁴¹KOH; ag-diethyl ether; corrected dipole moment of CH⁺.
• July 2009: HBO; H¹⁰BO.
• June 2009: CO⁺; CH₃D; ¹³CH₃D; l-C₄HD; l-C₃HD.
• May 2009: CO, v = 1 − 3; CH⁺; HOCN; HC(O)NH₂; H¹³C(O)NH₂; HC(O)¹⁵NH₂; HC(¹⁸O)NH₂; HNCO.
• Apr. 2009: n-C₃H₇CN; ethyl formate; SH⁺; CCP; ¹³CCP; C¹³CP.
• Mar. 2009: C₃H; C₃D; N₂H⁺, v = 0; N₂D⁺; ¹⁵NNH⁺; N¹⁵NH⁺; ¹⁵NND⁺; N¹⁵ND⁺; corrected parities for all C₃H entries.
• Feb. 2009: ¹³CCCO; C¹³CCO; CC¹³CO; C₃¹⁸O; C₂H₅C¹⁵N; CH₃CHDCN; CH₂D^ipCH₂CN; CH₂D^oopCH₂CN.
• Jan. 2009: C₂H^-; C₄H⁻; CN⁻; HCNO; DCNO; H¹³CNO; HC¹⁵NO; C₃O, v = 0; C₃O, v₅ = 1.
• Dec. 2008: HCCCHO; s-C₂H₅CHO; D₂³⁴S.
• Nov. 2008: H₂³⁴S; H₂³³S; HD³⁴S.
• Nov. 2008: corrected CH₃D entries because the catalog files did not contain the distortion corrections to the dipole moment.
• Oct. 2008: PH₃; HDS; α-alanine, conformer I; α-alanine, conformer II; H₂S; D₂S; C₅N⁻; CS, v = 0 − 4.
• Sep. 2008: ¹⁵NH₂D; ¹⁵NHD₂; C₄H⁻, C₄D⁻, HD¹³CO; D₂¹³CO.
• Sep. 2008: corrected tag for CCP. As a consequnce, the tag for HS₂ had to be corrected as well.
• Aug. 2008: SH⁺; CH₃CCH, v = 0; CH₃C₄H.
• July 2008: CS⁺; HS₂; BH; C₃N⁻.
• May 2008: ¹⁵NH₃; C₂H₃CN, v = 0; H₂¹³CCHCN, v = 0; H₂C¹³CHCN, v = 0; H₂CCH¹³CN, v = 0; H₂CCHC¹⁵N.
• April 2008: HeH⁺; PO; CCP; PN; P¹⁵N; TiO₂; ⁴⁶TiO₂; ⁵⁰TiO₂; corrected tag for ³⁶ArH⁺; corrected duplicate lines in c032504.cat and c033502.cat.
• Mar. 2008: DC₃N, v = 0; DC₃N, v₇ = 1; D¹³CCCN; DC¹³CCN; DCC¹³CN; DC₃¹⁵N; CH₃D.
• Feb. 2008: H₂CS.
• Jan. 2008: H₂DO⁺; HCCD; SiC₂, v = 0; SiC₂, v₃ = 1; SiC₂, v₃ = 2; Si¹³CC; ²⁹SiC₂; ³⁰SiC₂; H₂NCH₂CN.
• Dec. 2007: HCNH⁺; H¹³CNH⁺; NeH⁺; NeD⁺; ²²NeH⁺.
• Nov. 2007: corrected g_up values and a small typographical error in the D₂O entry.
• Oct. 2007: HCO⁺, v = 0; HCO⁺, v₂ = 1; H¹³CO⁺; DCO⁺; D¹³CO⁺; HC₃N, v₃ = 1; HC₃N, v₂ = 1; H₃O⁺.
• Sep. 2007: ArH⁺; ArD⁺; ³⁶ArH⁺.
• Aug. 2007: SiC₂, v = 0; Si¹³CC; ²⁹SiC₂; ³⁰SiC₂; SiC₂, v₃ = 1.
• July 2007: corrected coding of the format of the quantum numbers for C₃H and its isotopic species. Corrected intensity in C₃N, v = 0; the partition function had considered the lowest excited vibrational state, however, the old predictions did not.
• June 2007: HCP, v = 0; H¹³CP
• May 2007: NCS; CN⁻; HCN, v = 0; HCN, v₂ = 1; HCN, v₂ = 2; HCN, v₂ = 3; HCN, v₃ = 1; HCN, v₁ = 1; C₂H₂, v₅ − v₄.
• Apr. 2007: C₂H₅CN, v = 0; C₂H₅¹³CN, v = 0; CH₃¹³CH₂CN, v = 0; ¹³CH₃CH₂CN, v = 0; NaCN, NaNC; Na¹³CN, NaN¹³C; KCN, KNC; modified ethylenimine and SO¹⁷O entries.
• Mar. 2007: Si³⁴S, v = 0 − 2; Si³⁴S, v = 1 − 0; ³⁰SiS, v = 0 − 2; ³⁰SiS, v = 1 − 0; Si³³S, v = 0, 1 ; ²⁹Si³⁴S, v = 0, 1 ; ³⁰Si³⁴S, v = 0, 1; ²⁹Si³³S; ³⁰Si³³S; Si³⁶S; ²⁹Si³⁶S; ³⁰Si³⁶S; C₂H⁻
• Feb. 2007: SiS, v = 0 − 5; SiS, v = 1 − 0 and v = 2 − 1; SiS, v = 2 − 0; ²⁹SiS, v = 0 − 2; ²⁹SiS, v = 1 − 0
• Feb. 2007: corrected tags in entries 044510 and 044511; corrected some links to files with hyperfine splitting.
• Jan. 2007: SH⁻; C₄H⁻; C₈H⁻; NHD₂; D₂O
• Jan. 2007: corrected the degree of freedom in the rotational partition function for several linear molecules; see also the <a href=“/cdms/catalog/main_catalog.shtml#description”>brief description of the format of the catalog entries</a> in the <a href=“/cdms/catalog/main_catalog.shtml”>general section</a> of the CDMS catalog.
• Dec. 2006: H¹³C¹⁵N, v = 0; H¹³C¹⁵N, v₂ = 1; OH⁻; OD⁻; ¹⁸OH⁻
• Nov. 2006: ¹³CO; C₆H⁻
• Oct. 2006: H₂COH⁺; H₂¹³COH⁺
• Sep. 2006: CH₃OH, v_t = 0, 1; SiN; HNCNH; CH; CS, v = 1 − 0 and v = 2 − 1; CS, v = 2 − 0; ¹³CS, v = 1 − 0; C³⁴S, v = 1 − 0
• Aug. 2006: HCNH⁺; CH₃CNH⁺; S₂O, v = 0
• July 2006: omitted redundant vibrational identifier in c047501.cat and corrected coding of the quantum numbers
• June 2006: H₂CCNH; HC(O)CN; NCC(O)NH₂; NO⁺; NCHCCO
• May 2006: DC¹⁵N; D¹³C¹⁵N; H¹³CN, v = 0; H¹³CN, v₂ = 1
• Apr. 2006: Separate ortho and para transition frequencies are available through links in the documentation files for low energy states of H₂D⁺; HD₂⁺; CH₂; NH₂; NH₂D
• Apr. 2006: glycine, conf. I; glycine, conf. II; DCN, v = 0; DCN, v₂ = 1; D¹³CN; corrected QNFMT in c017501.cat, w017501.cat., c027501.cat, w027501.cat, c027503.cat, w027503.cat
• Mar. 2006: C₂H₂, v₅ − v₄; H₂CCCHCN; Ga-n-C₃H₇OH; C₅H; l-¹³CC₃H₂; l-C¹³CC₂H₂; l-C₂¹³CCH₂; l-C₃¹³CH₂; corrected entry for C₃, v₂ band
• Feb. 2006: H₂CS; D₂CS; NaC; H₂C³⁴S; H₂¹³CS; H₂C³³S; N₂D⁺; N₂H⁺, v = 0; N₂H⁺, v₂ = 1
• Jan. 2006: H¹³CCCN, v₆ = 1; HC¹³CCN, v₆ = 1; HCC¹³CN, v₆ = 1; H¹³CCCN, v₅ = 1 / v₇ = 3; HC¹³CCN, v₅ = 1 / v₇ = 3; HCC¹³CN, v₅ = 1 / v₇ = 3; HDC₂O; D₂C₂O
• Dec. 2005: C₃O₂, v₇; ¹³CC₅H; C¹³CC₄H; C₂¹³CC₃H; C₃¹³CC₂H; C₄C¹³CCH; C₅¹³CH; C₆D; HCC¹³CN, v₇ = 2; HC¹³CCN, v₇ = 2; H¹³CCCN, v₇ = 2
• Nov. 2005: C₂H₃NH₂, within 0⁺ & 0⁻; C₂H₃NH₂, 0⁻ ← 0⁺; OCS, v = 0; DNC; C₆H
• Oct. 2005: DCO⁺; HCO⁺, v = 0; HCO⁺, v₂ = 1; D¹³CO⁺; DC¹⁸O⁺; CH₃CCNC; HC₅N, v₇; corrected small error in predicted frequency uncertainties of c032503.cat and w032503.cat
• Sep. 2005: HD, v = 0, 1; C; ¹³C; CF⁺, v = 0, 1; CH₂; C₄D
• Aug. 2005: HC¹⁵N, v = 0; HC¹⁵N, v₂ = 1; HD₂⁺; H₂D⁺; H₂CO; ²⁹SiC₄; Si¹³CC₃; SiC¹³CC₂; SiC₂¹³CC; SiC₃¹³C; ³⁰SiC₄
• July 2005: SO₂, v = 0; SO₂, v₂ = 1; SO₂, v₂
• May 2005: CN, v = 0, 1; ¹³CN; C¹⁵N; ¹³C¹⁵N; CH₃CCH, v₁₀; CH₃CCH, v₉; corrected tags in c026503.cat
• April 2005: OCS, v = 0; OCS, v₂ = 1; OC³⁴S; O¹³CS; OC³³S; ¹⁸OCS; ¹⁷OCS; O¹³C³⁴S; OC³⁶S; O¹³C³³S; ¹⁸OC³⁴S; ¹⁸O¹³CS; corrected tags in c040504.cat, w040504.cat
• Mar. 2005: H₂C₂N; H₂C₄N; DC₃N, v₇ = 1; H¹³CCCN, v₇ = 1; HC¹³CCN, v₇ = 1; HCC¹³CN, v₇ = 1; HC₃¹⁵N, v₇ = 1; minor modification of DC₃N entry; corrected tags in c016502.cat, w016502.cat, and c050503.cat
• Feb. 2005: N₂H⁺; ¹⁵NNH⁺; N¹⁵NH⁺; N₂D⁺; HNCS; separated HNC, v₂ = 0, 1 and updated v = 0 entry
• Dec. 2004: H¹³C¹³CCN; H¹³CCCN; HC¹³CCN; HCC¹³CN; HCCC¹⁵N; HC¹⁸O⁺; HC₆N, adjusted HC₄N
• Nov. 2004: HC₅N, v₁₁ = 1; HC₅N, v₁₁ = 2; HC₅N, v₁₀ = 1; HC₅N, v₁₁ = 3; HC₅N, v₁₁ = 4; HC₅N, v₉ = 1
• Oct. 2004: D₂CO; HC₇N, v = 0; HC₇N, v₁₅ = 1; HC₇N, v₁₅ = 2; HC₁₁N; H¹³CC₄N; HC¹³CC₃N; HC₂¹³CC₂N; HC₃¹³CCN; HC₄¹³CN; HC₅¹⁵N; adjusted HC₉N, HC₅N, v = 0, and DC₅N
• Sep. 2004: NHD₂; DC₃N; DC₇N; H¹³CC₆N; HC¹³CC₅N; HC₂¹³CC₄N; HC₃¹³CC₃N; HC₄¹³CC₂N; HC₅¹³CCN; HC₆¹³CN; HC₇¹⁵N; adjusted HC₇N, v = 0
• Aug. 2004: HC₅N, v = 0; DC₅N; C₃H; C₃D; ¹³CCCH; C¹³CCH; CC¹³CH
• July 2004: corrected some links.
• July 2004: CH₂D⁺; KCl; K³⁷Cl; ⁴¹KCl
• June 2004: c-C₃H₄; butenyne (C₄H₄); methylenecyclopropene {(<strong>c-</strong>C₃H₂)CH₂}
• May 2004: HDCS; NH; gGg' ethylene glycol; NH₂D
• Apr. 2004: CCH, v₂ = 1; (CCH, v = 0); ¹³C³³S; ¹³C³⁶S; CH₃C₈H; CH₃C₇N; CH₃C₉N; (CH₃C₃N); HD₂⁺
• Mar. 2004: HOC⁺, v₂ = 0; HOC⁺, v₂ = 1; DOC⁺; NiCO; (FeCO); NiO; (NiC); (CoC)
• Feb. 2004: The catalog files are also available directly as plain ascii files.
• Feb. 2004: H¹³CO⁺; HC¹⁷O⁺; benzyne; ND
• Jan. 2004: H₂C₃H; CS, v = 0 − 2; C³⁴S, v = 0, 1; ¹³CS, v = 0, 1; C³³S, v = 0, 1; C³⁶S; ¹³C³⁴S
• Dec. 2003: C₃N, v = 0; C₃N, v₅ = 1; ¹³CCCN; C¹³CCN; CC¹³CN; C₃¹⁵N; AlCN; altered AlNC entry
• Nov. 2003: aa-(C₂H₅)₂O; TiO; H₂C₂O; H₂C¹³CO; H₂¹³CCO; H₂C₂¹⁸O; HDC₂O; D₂C₂O
• Nov. 2003: indicated detection of species in ISM/CSM in remaining documentations. Please feel free to report errors with references. Corrected some relative terrestrial (!) isotopic abundances.
• Oct. 2003: H₂CCN
• Sep. 2003: aGg' ethylene glycol
• Aug. 2003: C₂N; ONCN; HPO; HCS; HSC
• Aug. 2003: The catalog directory is given in html format.
• July 2003: t-HCOOH; c-HCOOH; t-H¹³COOH; TiN; NCO
• June 2003: HCS⁺; H¹³CS⁺; DCS⁺; HC³⁴S⁺
• Apr. 2003: OH⁺; HC₁₃N; t-HC₃O; ScCl; Sc³⁷Cl
• Mar. 2003: NH₂OH; H₂CO; NCS; ScF
• Feb. 2003: H¹³CC¹³CN; C₃, v₂; NaF, v = 0, 1; KF, v = 0, 1; HCN, v = 0; HCN, v₂ = 1
• Jan. 2003: C¹⁷O; ¹³C¹⁷O; CH₃CCH, v = 0; CH₃CCH, v₁₀ = 1; butenyne (C₄H₄); HCC¹³C¹⁵N; HC¹³C¹³CN
• Dec. 2002: CH₃OH; ¹³CH₃OH
• Nov. 2002: added note to documentation whether species has been observed in ISM or CSM (interstellar or circumstellar medium).
• Oct. 2002: NaC; CaC; H₂C₃S; l-H₂C₃O
• Sep. 2002: HCN, v = 0; NaCl, v = 0, 1; Na³⁷Cl, v = 0, 1; CH₃C₅N; CH₃C₄H; CH₃C₆H
• June 2002: H₂C₂S; ND₃; l-C₃H₂; l-¹³CCCH₂; l-C¹³CCH₂; l-CC¹³CH₂
• May 2002: l-C₄H₂; l-C₅H₂; l-C₆H₂; l-C₇H₂
• Apr. 2002: CH₃CCD; CH₂DCCH
• Feb. 2002: l-H₂C₃O; CuH; ⁶⁵CuH; ZnH; ⁶⁶ZnH; ⁶⁸ZnH
• Jan. 2002: SiCN; SiNC; SiCCH
• Dec. 2001: C₃S; C¹³CCS; ¹³CCCS; C₃³⁴S; FeCO
• Nov. 2001: Added remarks on the existence of more than one spin state where applicable. This may be important at low temperatures.
• Nov. 2001: PH₂; CCS; C₄S; l-C₇H₂
• Oct. 2001: NH₂; s-H2C=CHOH; a-H2C=CHOH
• Sep. 2001: CaF; CaCl; CoC; NiC
• Aug. 2001: PNO; HPO; PH; H₂CP
• July 2001: ¹³CCCCH; C¹³CCCH; CC¹³CCH; CCC¹³CH
• June 2001: C¹⁸O; HC₇N; CH₂(OH)CHO; HC₉N
• May 2001: MgH; HCNH⁺; HCND⁺; HC₄NC
• Feb. 2001: The tags for H₂C¹⁸O and for ¹³C¹⁸O have changed because of a wrong tag for the former.
• Jan. 2001: Each documentation contains a stick diagram of the spectrum at 300 K.
• Jan. 2001: KC; NaCH; KCH; NaH; KH; SiCN
• Dec. 2000: HC₃N, v₆ = v₇ = 1; SiO; ²⁹SiO; ³⁰SiO; Si¹⁸O; HNC, v₂ = 0, 1; HC₃NH⁺
• Nov. 2000: SiC₄; l-SiC₃; SiC₅; SiC₆; MgCCH; NaCCH
• Oct. 2000: HC₃N, v = 0, v₇ = 1, v₇ = 2, v₆ = 1, v₄ = 1, v₄ = v₇ = 1; HC₃P; NC₂P; H₂C₂O; CO, v = 0
• Sep. 2000: C₂H₃NH₂ (vinylamine); CH₂(OH)CHO (glycolaldehyde); C₄H, v = 0, v₇ = 1, v₇ = 2⁰, v₇ = 2²; C₄D
• Aug. 2000: TiO; FeC
• July 2000: ¹³C¹⁸O; H₂CN; C₈H; C₇H; C₉H; C₁₀H;
• June 2000: MgF; MgCl; CH₃C₃N
• May 2000: ¹³CCH, C¹³CH; H₂¹³CO; CF; MgNC, v₂ = 0; l-H₂C₅; l-H₂C₆
• April 2000: CCH; CCD; HCN, v = 0; H¹³CN; H₂COH⁺; l-HC₄N; ¹³CO
• Some catalog entries are available with frequencies in units of cm⁻¹. This applies mainly to light hydrides and some stable molecules that might be of interest as secondary standards.

• Jan. 2007: added Remarks on Selection Rules.

• Dec. 2018: A new group was defined: ISM, molecules detected in the interstellar medium, but not in circumstellar shells of late-type stars.
• Nov. 2018: A bug in the calculation of A values was fixed. This affected transitions with g_up larger than 999.
• Dec. 2015: new molecule group: cyclic species.
• Sep. 2011: new molecule group: halogen compounds.
• Feb. 2011: new molecule group: complex molecules.
• Aug. 2010: new molecule group: atomic fine structure.
• Dec. 2009: new molecule group: metal compounds.
• Jan. 2007: new molecule group: Anions.
• Mar. 2006: new molecule groups: C_nH and C_nH₂.
• Oct. 2005: new sorting criterion available: lower state energy; optimized conversion - apparently with minute effects
• Aug. 2005: corrected y-axis labeling in graphic output.
• June 2005: New conversion option I → Sμ² is available. Output of value is possible for intensity I, A-value, or line strength Sμ² instead of decadic logarithm of value (default). This afforded more characters for some columns.
• Dec. 2004: Defined several new special groups.
• Nov. 2004: Several smaller changes in the appearance.
• Sep. 2004: Corrected a bug that temporarily prevented search output from being created. Minor modification of graphical output.
• Feb. 2004: New search option available: Searches are possible within a predefined group of species, e.g. only those already observed in the ISM or CSM besides searching for all molecules in the database or specified ones.
• Sep. 2003: Added additional output option and removed small bugs.
• Aug. 2003: Several changes; including default values for all selections except the molecules. Output as text can be sorted by species (followed by frequency), be frequency, or by intensity. Graphic output has been optimized.
• July 2003: Removed bug that caused wrong A values if frequencies were requested in units of cm⁻¹ and another one that took the decadic logarithm of lg(Sμ²). Minor modification of search page.
• Mar. 2001: The A value (base 10 logarithm) can be requested instead of the intensity at a certain temperature.
• Feb. 2001: A recalculation of the intensities of a search output can be requested for 300 (default), 225, 150, 75, 37.5, 18.75, and 9.375 K. A specific species may be highlighted in a graphic output.
• Jan. 2001: added graphic output option: stick diagram of the spectrum in the requested region.
• Dec. 2000: added some checks of the input
• May 2000: removed a bug that gave no output for some entries
• May 2000: added head to the output that gives some information on the catalog entries

• Aug. 2003: A new subsection has been added which gives the decadic logarithm of the partition function at selected temperatures.

• Jun. 2023: added HSO with documentation; updated H₂NC and oxirane entries.
• May 2023: added HMgC₃N, NaCCCN, MgC₄H⁺, MgC₃N⁺, MgC₆H⁺, and MgC₅N⁺.
• Mar. 2023: added methylketene with documentation; updated acetaldehyde and methylamine.
• Feb. 2023: added C₇N⁻ and C₁₀H⁻ with documentations; updated NH₂.
• Dec. 2022: added SiP, MgC₂, and NC₄NH⁺ with documentations.
• Nov. 2022: added HC₄S and ethynylbutatrienylidene with documentation, updated the oxirane entry.
• Oct. 2022: added 2-cyanoindene with documentation.
• Aug. 2022: added ethenylidenecyclopentadiene with documentation; updated ethenol documentation.
• Jul. 2022: added c-C₃C₂H, CH₂CCHC₄H, and cyanopropene species with documentations; updated H₂CCCHC₃N documentation.
• Jun. 2022: added n- and i-propanol with documentations.
• May 2022: added PO⁺; updated NO⁺ documentation.
• Apr. 2022: added ethenediol and tentatively detected 3-hydroxypropenal; added extragalactic PN; updated extragalactic ArH⁺ documentation.
• Mar. 2022: added HCCS⁺, C₅H⁺, HCCNCH⁺ and HC₇NH⁺ with documentations; added tentative detection of cyanoheptatriyne; included tentatively detected ethylamine in the table; updated C₃H⁺ and CH₃C₄H documentations.
• Jan. 2022: added extragalactic methyl formate and dimethyl ether with documentations.
• Dec. 2021: added HC₃O, C₅O, vinylamine, 1-, and 2-ethynylcyclopentadiene with documentations; added C₃O documentation, updated those of C₂O and H₂CCNH.
• Nov. 2021: added CH₂CCCN with documentation.
• Oct. 2021: added ethyl isocyanate and galactic as well as extragalactic H₂NC detections with documentations; updated H₂CN documentation.
• Sep. 2021: added MgC₅N and MgC₆H with documentations; added H₂CN documentation.
• Aug. 2021: added HNCN, ortho-benzyne, and H₂CCCHC₃N with documentations; updated the dimethyl ether documentation.
• Jul. 2021: updated CH⁺ and SH⁺ entries.
• Jun. 2021: added pentatetraenylidene, thiopropynal, and cyanothioformaldehyde; updated glycolaldehyde, propyne, methylcyanoacetylene, and formyl cyanide entries.
• May 2021: added propargyl, butenyne, ethynylallene, thioformic acid, ethynylcyclopropenylidene, cyclopentadiene, indene, and ethanolamine; updated methanethiol, ethanethiol, and ethenol entries.
• Apr. 2021: added 1- and 2-cyanocyclopentadiene, 1- and 2-cyanonaphtalene, NCS, HCCS, H₂C₂S, H₂C₃S, and C₄S; updated 3-butynenitrile, benzonitrile, HC₁₁N, and C₅S entries.
• Feb. 2021: Added HC₃S⁺, CH₃CO⁺, (2E)-penten-4-ynenitrile, and cyanoethynylethene with documentations; updated propenal, propene, and H₂CCN entries.
• Dec. 2020: updated AlO, TiO, and acetic acid entries.
• Nov. 2020: updated HCCNC, HNC₃, and urea entries.
• Oct. 2020: added HC₄NC, 3-butynenitrile, ethynyloxomethylium, and butadiynyliminomethylium with documentations; updated acetamide documentation; modified iminomethylium entry.
• Sep. 2020: updated C₃N⁻ and C₅N⁻ documentations, and modified that of C₅S.
• Aug. 2020: added iminopropyne, hydroxylamine, and hydroxypropanone with documentations; updated CH₃NH₂, HC₇N, and HC₉N documentations.
• May 2020: updated HeH⁺ and CH⁺ entries.
• Apr. 2020: added extragalactic C₃N, l-C₃H⁺, H₂CN, HCOOH, CH₃SH, and C₂H₃CN with documentations.
• Mar. 2020: added propyne documentation; updated methoxymethanol and ethyl methyl ether documentations.
• Feb. 2020: added extragalactic O₂ and updated galactic C₃ documentation.
• Oct. 2019: added MgC₃N, MgC₂H, and MgC₄H with documentations; corrected and updated links.
• Sep. 2019: updated HNCO entry.
• July 2019: added CaNC and urea with documentations; updated cyclopropenylidene, formamide, N-methylformamide, methoxymethanol, and ethyl methyl ether documentations.
• June 2019: updated methylamine and acetic acid documentations.
• Apr. 2019: added HeH⁺ with documentation; updated ethanal and acetamide documentations.
• Mar. 2019: added HONO with documentation, updated methyl formate entry.
• Jan. 2019: updated entries for H₂CCO, HCOOH, CH₃CHO, C₂H₅OH, cyanomethanimine, HNCCN⁺, CH₃CN and H₂NCHO.
• Oct. 2018: updated SiO documentation.
• Aug. 2018: added documentation for CH₃NC, updated those on H₂S and CH₃CN.
• July 2018: added CNCN and potential identification of C₅S with documentations.
• May 2018: addened NCO with documentation; updated cyanamide, HOCN, and H₂NCO⁺ documentations.
• Mar. 2018: added HCS and HSC with documentations; updated H₂CO documentation.
• Feb. 2018: added thionitrosylium with documentation.
• Jan. 2018: added benzonitrile with documentation; added HC₅N documentation; updated HC₇N documentation.
• Dec. 2017: added HC₇O, methoxymethanol, and HS₂ with documentations; added HCCNC and HNC₃ documentations; updated SiS documentation; omitted HC₁₁N from the table.
• Nov. 2017: added extragalactic SH⁺ with documentation; updated extragalactic CH⁺ documentation.
• Oct. 2017: added CH₃Cl; SiH₃CN; and CH₃SiH₃ with documentations; updated c-C₃H; CH₃CN; formamide; CH₃CHO; C₆H₂; C₇H; and CH₃C₄H documentations.
• Aug. 2017: updated propyl cyanides and extragalactic C₂S and H₂CNH documentations.
• July 2017: added HC₅O with documentation; added tentative detection of N-methylformamide with documentation; updated SiS and CH₃NCO documentations.
• May 2017: updated H₃⁺ documentation.
• Mar. 2017: updated titanium oxides documentation.
• Jan. 2017: added formaldehyde documentation and updated ethylene oxide, acetone, and propanal entries.
• Nov. 2016: added N₂ with documentation; updated HCS⁺, formic acid, ethanol, methyl formate, glycolaldehyde, ethanediol, n-propyl cyanide, and HC₁₁N documentations.
• Aug. 2016: added PN documentation; updated PO, AlO, and HOCO⁺ documentations.
• July 2016: updated CH₃SH documentation.
• June 2016: added propylene oxide with documentation; updated HNCO, formamide, and ethyl cyanide documentations.
• Apr. 2016: added extragalactic CF⁺ with documentation, updated hydroxymethylium documentation.
• Mar. 2016: added methylamine documentation; updated CH₃NCO documentation.
• Feb. 2016: added documentation on l-C₃H₂ and on l-C₄H₂; updated propynal, cyclopropenone, and methoxy documentations.
• Dec. 2015: updated H₃⁺, SH⁺, and SH entries.
• Oct. 2015: added CH₃NCO, C₆₀⁺, and extragalactic ArH⁺; updated ethyl methyl ether.
• July 2015: added NCCNH⁺ with documentation; added HCNH⁺ and HC₃NH⁺ documentations.
• June 2015: added Si₂C with documentation.
• May 2015: added HCCO with documentation; added documentations for HCO and c-SiC₃; updated propene and CF⁺ entries.
• Apr. 2015: updated ethanediol entry.
• Feb. 2015: relegated tentatively detected ethyl methyl ether to undetected molecule.
• Dec. 2014: Added SiO documentation.
• Nov. 2014: Updated dimethyl ether and vinyl cyanide documentations.
• Oct. 2014: Added i-propyl cyanide, cyanomethylidyne, and nitrosylium (tentative) with documentations.
• July 2014: Added extragalactic NH₂ with documentation; updated documentations for galactic PH₃ and SH⁺.
• June 2014: Added C₂H₅SH and extragalactic H₂Cl⁺ with documentations; updated ArH⁺ documentation.
• Feb. 2014: Updated documentation for l-C₃H⁺.
• Jan. 2014: Combined H₃⁺ entry with that for H₂D⁺ and HD₂⁺ for consistency reasons and updated the entry. Also updated were documentations on HNC, including extragalactic, and acetaldehyde.
• Dec. 2013: added ArH⁺ with documentation; updated OH⁺ and H₂O⁺ documentations.
• Nov. 2013: added H₂NCO⁺ with documentation; updated HF and HCl documentations.
• Sep. 2013: added HMgNC with documentation.
• July 2013: added methyl acetate with documentation; updated ethyl formate and C₃H⁺ documentations; created separate propyl cyanide documentation.
• June 2013: added ammonium with documentation; updated c-SiC₂ and extragalactic fullerenes entries.
• May 2013: updated dimethyl ether, c-C₃H₂, and C₃H⁺ documentations.
• Apr. 2013: added Extragalactic formamide and HCS⁺; updated Extragalactic HF, OH⁺, H₂O⁺, and H₃O⁺ documentations.
• Mar. 2013: added TiO and TiO₂ with documentations.
• Feb. 2013: added ethanimine and cyanomethanimine with documentations; updated formamide documentation.
• Nov. 2012: added C₃H⁺ with documentation; added documentation for HCO⁺; updated documentations on methyl formate and CF⁺.
• Oct. 2012: added HNCNH and CH₃O with documentations.
• Sep. 2012: added documentations for SiC, C₂S, and C₃S; updated documentation for glycolaldehyde; provided additional information for CCO.
• Aug. 2012: added documentations for C₆H₂, CH₃C₃N, and for oxirane, c-C₂H₄O; corrected documentation for formamide; updated documentations for methyl formate and for CH₃C₅N.
• July 2012: updated documentations for HF, HCOOH, ethanol, dimethyl ether, methyl formate, glycolaldehyde, ethylene glycol.
• May 2012: added SH, HCl⁺, and HO₂ with documentations, updated O₂ documentation; added Extragalactic SO⁺, l-C₃H, l-C₃H₂, H₂CCN, H₂CCO, C₄H, CH₃NH₂, CH₃CHO, mono-, di-, triacetylene, and benzene with documentations.
• Apr. 2012: added HNC, HC₇N, and vinyl alcohol documentations; updated and extended the one for glycolaldehyde.
• Mar. 2012: added further details for HNCO, HOCO⁺, H₂CNH, H₂C₂O, CH₃CHO, and C₂H₃CN, and H₂Cl⁺.
• Jan. 2012: added C₂H documentation; updated C₆₀ documentation (both Galactic as well as Extragalactic); provided additional information in HC₂N / HC₄N documentation.
• Dec. 2011: added cyanamide documentation; updated acetamide documentation.
• Sep. 2011: added documentations for c-C₃H and l-C₃H; updated HCS⁺.
• Aug. 2011: added documentation for NS; updated HCl, HF, and O₂.
• July 2011: added documentation for H₂CS and updated the one for H₂CCN.
• June 2011: added H₂O₂; updated HCN, polyacetylenes, and C₆₀; added extragalactic C₆₀.
• May 2011: added FeCN; updated H₃O⁺.
• Apr. 2011: added KCN; added documentations for MgNC and MgCN; updated documentations for CH⁺, NH, and methyl formate.
• Mar. 2011: added documentations for SiC₂ and c-C₃H₂.
• Jan. 2011: added documentation for acetylene, updated and modified those for di- and triacetylene, and modified the one for benzene.
• Dec. 2010: added SH⁺ and Extragalactic HF; updated interstellar HF.
• Oct. 2010: added H₂Cl⁺, C₆₀, and C₇₀ as well as Extragalactic NH, OH⁺, and H₂O⁺; added documentations for CH₃SH and dimethyl ether and updated the one for C₂H₅CN.
• Aug. 2010: added documentations for C₃, C₅, and C₄Si; updated OH⁺.
• July 2010: added OH⁺, H₂O⁺, CN⁻; updated Extragalactic CO⁺ and HC₃N.
• May 2010: updated HOCN documentation. Omitted SH because the detection refers to the stellar atmosphere.
• Mar. 2010: added AlOH.
• Jan. 2010: added documentation for CH₃CN and updated documentation for NH₃.
• Nov. 2009: added documentations for ethanol and ethanal.
• Sep. 2009: added HSCN; added documentation for HNCS.
• June 2009: updated documentation for HC₉N.
• May 2009: added HOCN; added documentation for HNCO, HC(O)NH₂, and CO⁺; updated documentation for formic acid.
• Apr. 2009: added ethyl formate and n-propyl cyanide as well as links to a MPIfR press release; updated aminoacetonitrile.
• Mar. 2009: added AlO.
• Feb. 2009: added HCNO.
• Oct. 2008: added C₅N⁻; added H₂S and SiH₄ documentations, modified the one for HC₁₁N, and updated the one for C₆H.
• June 2008: added tentative detection of PH₃; updated SiS and vinyl cyanide documentations.
• Apr. 2008: added C₃N⁻.
• Mar. 2008: added HC(O)CN; added HOCO⁺ documentation.
• Jan. 2008: added extragalactic H₃O⁺; added aminoacetonitrile; added H₃O⁺ documentation; updated entries for C₆H⁻ and C₄H⁻.
• Aug. 2007: added C₃C₆ and PO.
• July 2007: added C₈H⁻.
• May 2007: added C₄H⁻ and HCP; added documentation to C₄H, C₅H, C₇H, C₈H, and to CP.
• Apr. 2007: added documentation to H₂O and NaCN; updated ethyl cyanide and O₂ documentations.
• Mar. 2007: added documentations to HCl, HF, NH, NH₂; updated HCN and ethyl cyanide documentations; modified CH⁺ documentation.
• Feb. 2007: added documentation to SiS and methyl formate; modified documentation to formic acid.
• Nov. 2006: added C₆H^- and documentation to C₆H.
• Oct. 2006: added documentation to H₂COH⁺.
• June 2006: added H₂CCNH and SiH with comments; added comments to H₂CCO; H₂CNH; updated NH₃
• May 2006: modified placement of glycine and added comments on not-yet-detection of dihydroxyacetone.
• Apr. 2006: added 1,3,5-heptatriyne and acetamide
• Feb. 2006: added cyanoallene, cyclopropenone, and ethyl methyl ether; added documentations to SiN, CH₂, HC₉N, HC₁₁N, and acetone; updated the ones for O₂, CH⁺, and glycolaldehyde
• Dec. 2005: updated ethylene glycol entry
• Sep. 2005: a new table is available. It contains molecules detected outside of our galaxis. Links with some basic information on the detection is given for all species.
• Sep. 2005, ISM/CSS: added documentations to CF⁺, CH₃C₅N, and AlNC.
• Dec. 2004: erased CH₂D⁺ because no information is available in the literature; added information on NH₃ and updated glycine.
• Nov. 2004: added SiNC and l-HC₄N as well as information on these and related SiCN and HCCN species.
• Sep. 2004: updated information on glycolaldehyde
• July 2004: added propenal, propanal, information on these species and on propynal, methyldiacetylene, and ethyl cyanide
• May 2004: updated information on ethylene glycol
• Apr. 2004: added information on HCN and H₂D⁺/HD₂⁺
• Dec. 2003: added information on CCO, C₂H₃CN, C₅N, H₂CCN, HCS⁺, O₂
• Oct. 2003: updated glycine comment and added comments to HC₄H, HC₆H, and benzene.
• Sep. 2003: added glycine and comments to some entries.
• Jan. 2001: A new section has been added to the Cologne Database for Molecular Spectroscopy which lists the known molecules in space. Currently, “only” this list is presented. Links to the catalog entries and to some basic background information is intended.

• June 2017: added NO files with FTIR data.
• Apr. 2016: added ethanethiol files.
• Jan. 2016: updated OH⁺.
• Apr. 2015: added NO files.
• May 2012: added updated c-C₃H₂ files.
• Feb. 2012: added SF₂.
• Mar. 2011: added c-C₃H₂.
• Nov. 2010: added CH₂ files; moved D₂O files from data section to this section.
• Aug. 2010: updated HNC, v₂ = 0 & 1 files.
• June 2010: updated and corrected C₃H files and documentation according to the catalog entry from March 2009.
• Jan. 2010: added O₂, X ³Σ⁻, v = 0; CH₃CN, v = 0; and FSO₃. Documentations will follow later.
• Oct. 2008: added NF₂ files with some documentation.
• Aug. 2008: updated files are available for CH₃CCH, v = 0, in a separate folder. The remaining files will be updated in the near future.
• May 2007: new source codes are available. They have been tested to some extent.
• Feb. 2007: added SiS.
• Jan. 2007: added D₂O.
• Sep. 2006: updated CH
• Sep. 2006: new source codes are available. They have been tested to some extent.
• June 2006: added HCOCN
• May 2006: new source codes are available. They have been tested to some extent.
• Nov. 2005: modified vinylamine files and added documentation.
• Aug. 2005: added OH⁺ files; updated HD₂⁺ files;
• Jan. 2005: added CO files with line uncertainties multiplied by 100.
• Aug. 2004: updated C₃H
• July 2004: added KCl
• May 2004: added NH; aGg' ethylene glycol; DCN
• Apr. 2004: added HD₂⁺ example; new source codes are available
• Mar. 2004: added NiO example; modified HCP example; added HNC example
• Sep. 2001: added Ar⋅⋅⋅SO₂ example; new versions of the programs are available;
• July 2001: new versions of the programs are available
• Mar. 2001: added ClNO₂ example
• Feb. 2001: some modifications to the documentation for SPFIT/SPCAT including recent alterations made by HMP to the JPL version; includes corrections in the explanation of the coding of the quantum numbers
• Jan. 2001: added FClO₃ example
• June − Aug. 2000: added some examples
• June 2000: some basic information concerning the examples is given on the examples page

• Sep. 2022: added c-C₂H₃DO files.
• Mar. 2022: added CD₃OH, oxirane, and gauche-propanal files.
• Feb. 2021: added cyclopropenone files.
• Sep. 2020: the new n-propyl cyanide files are now available.
• Aug. 2020: HC₅N and HC₇N files are available with catalog files and others.
• Apr. 2020: Propyne files are available with catalog files and others.
• Dec. 2019: Added aminomethylium files.
• Nov. 2019: Added ¹³CH₃SH files.
• Aug. 2019: Added CH₃SH files.
• June 2019: Added CH₃³⁴SH files.
• May 2019: Added acetic acid files.
• Mar. 2019: Added cyanamide and vinyl mercaptan files as well as those of the gauche-conformers of 2-cyanobutane. Updated CDMS links in several arXiv versions of manuscripts and made some available newly. The same applies to the Catalog Archive.
• Jan. 2019: Added CH₃SD and H₂CS files.
• Aug. 2018: Added 3-methylbutyronitrile files.
• Feb. 2018: Added CHD₂⁺ files.
• Jan. 2018: Added extended HD₂⁺ files (plus one line, basis of the new entry) as well as alternative fits. Added also propanal files.
• Sep. 2017: Added 2-Cyano-anti-butane files.
• Mar. 2017: The new H₂D⁺ and HD₂⁺ files are available.
• Feb. 2017: added H₂C¹⁷O; updated H₂C¹⁸O and H₂CO.
• Dec. 2016: added n-C₃H₇CN files.
• Oct. 2016: added CH₃CN, v₈ ≤ 2 as well as v₈ = 1 for ¹³C and ¹⁵N singly substituted species of CH₃CN.
• Sep. 2016: added new CH₂D⁺ files.
• Aug. 2015: added deuterated ethanol files.
• May 2015: added dimethyl ether files.
• Aug. 2014: added aG'g-propanediol; gG'a-propanediol; g'G'g-propanediol.
• Feb. 2014: added SiO.
• Oct. 2013: added CO⁺ and CH₂D⁺.
• Apr. 2013: added, updated, and corrected files in the HCP section.
• Aug. 2012: added files for ¹³C isotopomers of ethanol (anti conformers).
• Mar. 2012: added n-butyl cyanide files.
• June 2011: added TiO₂ files.
• May 2011: added NHD₂ files with several auxiliary files.
• Mar. 2011: added iso-propyl cyanide files.
• June 2010: updated CCH files.
• Feb. 2010: added O₂, a ¹Δ.
• Jan. 2010: added O₂, X ³Σ⁻, v = 0; O¹⁸O; ¹⁸O₂.
• Dec. 2009: added data for ground states of methyl cyanide isotopologs.
• Aug. 2009: added diethyl ether.
• Apr. 2009: added vinyl cyanide.
• Apr. 2008: added SiS.
• Feb. 2008: added H₂CS.
• July 2005: added HC¹⁵N and new SO₂ files.
• July 2004: added butenyne, C₄H₄; linked KCl;
• May 2004: linked NH; added DCN isotopomers; linked aGg' ethylene glycol; added gGg' ethylene glycol;
• Apr. 2004: linked CCH
• Mar. 2004: linked HNC
• June 2003: added HCS⁺ isotopomers
• Mar. 2003: NH₂OH
• Feb. 2003: H¹³CC¹³CN; C₃, v₂; HCN, v = 0; HCN, v₂ = 1
• Jan. 2003: C¹⁷O; ¹³C¹⁷O; CH₃CCH, v = 0; CH₃CCH, v₁₀ = 1; butenyne (C₄H₄); HCC¹³C¹⁵N; HC¹³C¹³CN
• Sep. 2002: updated HCN, v = 0;
• Nov. 2001: new and updated entries are available, among them NH₂ and PH₂.
• July 2000: updated available entries