What's new?

The database is described in

H. S. P. Müller, F. Schlöder, J. Stutzki, and G. Winnewisser,
J. Mol. Struct. 742, 215–227 (2005)

and in

H. S. P. Müller, S. Thorwirth, D. A. Roth, and G. Winnewisser,
Astronomy and Astrophysics 370, L49–L52 (2001).

Please acknowledge use of the CDMS by citing these article. You are very welcome to state the web address also. We recommend to cite the original sources of the data too, which are given in the documentations, at least as far as this is feasible.

• 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• Oct./Nov. 2018: Several outdated links were corrected.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.

• Nov. 2009: added note in the link which explains the aggregate spin number.

• 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 gup larger than 999.
• Dec. 2015: new molecule group: cyclic species.

• Apr. 2010: started to add values at 2.725 and 5 K for some species. The log values are also displayed in the partition function table.

• 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.

• June 2017: added NO files with FTIR data.
• Apr. 2016: added ethanethiol files.
• Jan. 2016: updated OH⁺.

• 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-<em>anti</em>-butane files.
• Mar. 2017: The new H₂D⁺ and HD₂⁺ files are available.
• Feb. 2017: added H₂C¹⁷O; updated H₂C¹⁸O and H₂CO.