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• Oct./Nov. 2018: Several outdated links were corrected.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

Note: Deuterium isotopic species are given separately only if their method of detection is intrinsically different from that of pure hydrogen ones. We plan to modify this in the future to include them with all hydrogen species.

The documentations generally provide information on the detection of the respective molecules, including minor isotopic species, molecules in excited vibrational states, or different media in which the species has been detected as well as links to articles.

All molecules have been detected (a lso) by rotational spectroscopy in the radiofrequency to far-infrared regions unless indicated otherwise.

* indicates molecules that have been detected by their rotation-vibration spectrum,
**those detected by electronic spectroscopy only.

Transition metal molecules detected in atmospheres of stars by electronic spectroscopy are currently not included. We plan to create a new table in the not so distant future dealing with molecules in stellar atmospheres. In this context, the table of molecules detected in the interstellar medium (ISM) or circumstellar envelopes (CSE) of late type stars, will be split. In the case of some metal monoxides, emission features have been detected in optical or IR spectra. Most likely, this emission indicates a presence of these molecules in the circumstellar shell. Around one handful of molecules may have to be added.