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.

Earlier Catalog Entries

Mar. 2026: 1H-cyclopent[cd]indene; ¹³CH₂DCN; CH₂D¹³CN; CH₂DC¹⁵N.
Feb. 2026: HeH⁺; mercaptoethanol.
Jan. 2026: 2-Aminopropenenitrile; trans-HNSO; ¹³CH₃C¹⁵N; CH₃¹³C¹⁵N; ¹³CH₃¹³CN; methylallene.
Dec. 2025: NCCO⁺; CH₂DC₄H; CH₃C₄D; ¹³CH₃C₄H; CH₃¹³CC₃H; CH₃C¹³CCCH; CH₃CC¹³CCH; CH₃C₃¹³CH.
Nov. 2025: 3-hydroxypropanal; c-S₄; CH₃C(O)CCH; CH₃OCCH; CH₃SCCH.
Oct. 2025: ¹³CCS; C¹³CS; ¹³C¹³CS; CC³³S; C¹³C³⁴S; C₄S; C₃³³S; C¹³CCS; ¹³CCCS; C₅S; ¹³CCCCS; C¹³CCCS; CC¹³CCS; CCC¹³CS; C₄³⁴S.
Sep. 2025: Phenalene; CCS; CC³⁴S.
Aug. 2025: HC(O)-c-¹³CHCH₂O; HC(O)-c-CH¹³CH₂O; H¹³C(O)-c-CHCH₂O; SiC₅; SiC₇; SiC₈; ²⁹SiC₆; ³⁰SiC₆; H₂NCO.
Jul. 2025: HC(O)-c-C₂H₃O, v = 0; HC(O)-c-C₂H₃O, v₂₁ = 1

Nov. 2023: The information on the meaning of lower case characters as quantum numbers was misleading and has been rephrased. The term g_I was missing in several “useful equations” because it was assumed to be 1 initially.
Mar. 2019: The program of the VAMDC-CDMS was updated. The Classic or ascii-CDMS was moved to this server. Links have been corrected and should work, but a detailed check is pending. The coding of special characters has been adjusted.
Nov. 2009: added note in the link which explains the aggregate spin number.

Archive "Catalog Search Form"

Nov. 2021: A new group was defined: Other hydrocarbons, that are hydrocarbons different from the carbon chain species C_nH and C_nH₂, but including isotopologs.

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.

Archive "Molecules in Space"

Mar. 2026: added 2-hydroxypropanal and methoxyethanal with documentations, updated methyl acetate, hydroxypropanone, and ethyl formate documentations.
Feb. 2026: added propadienone and 1H-cyclopent[cd]indene with documentations; updated NH₃, H₃O⁺, CH₃OH, cyclopropenone, and cyclopropenethione documentations.
Jan. 2026: added 3- and 4-cyanoacenaphthylene with documentations.
Dec. 2025: updated methylium documentation.
Nov. 2025: added CaS with documentation and extragalactic HCl with documentation; updated N-methylformamide, CH₃C₄H, and extragalactic H₂Cl⁺ documentations.
Oct. 2025: added C₂H₄ documentation.
Sep. 2025: added (linear) SiC₃, SiC₅, and phenalene with documentations.
Aug. 2025: added SiC₆ with documentation; updated SiC₄ documentation.
Jul. 2025: updated HS₂ and methyl formate documentations.