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Astron. Astrophys. Suppl. Ser.
Volume 146, Number 1, October I 2000
Page(s) 157 - 168
Published online 15 October 2000
DOI: 10.1051/aas:2000265

Astron. Astrophys. Suppl. Ser. 146, 157-168

The UMIST database for astrochemistry 1999[*]

Y.H. Le Teuff - T.J. Millar - A.J. Markwick

Send offprint request: Y.H. Le Teuff

Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK

Received January 31; accepted July 4, 2000


We report a new version of the UMIST database for astrochemistry. The previous (1995) version has been updated and its format has been revised. The database contains the rate coefficients, temperature ranges and - where available - the temperature dependence of 4113 gas-phase reactions important in astrophysical environments. The data involve 396 species and 12 elements. We have also tabulated permanent electric dipole moments of the neutral species and heats of formation. A new table lists the photo process cross sections (ionisation, dissociation, fragmentation) for a few species for which these quantities have been measured. Data for Deuterium fractionation are given in a separate table. Finally, a new online Java applet for data extraction has been created and its use is explained in detail. The detailed new datafiles and associated software are available on the World Wide Web at

Key words: molecular data -- molecular processes -- ISM: molecules -- circumstellar matter

Copyright The European Southern Observatory (ESO)

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