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Issue A&A
Volume 390, Number 2, August I 2002
Page(s) 793 - 800
Section Atomic and molecular data
DOI http://dx.doi.org/10.1051/0004-6361:20020800



A&A 390, 793-800 (2002)
DOI: 10.1051/0004-6361:20020800

Collisional excitation rates of H $\mathsf{_2}$O with H $\mathsf{_2}$

I. Pure rotational excitation rates with para-H $\mathsf{_2}$ at very low temperature
M.-L. Dubernet and A. Grosjean

Laboratoire d'Astrophysique, UMR CNRS 6091, Observatoire de Besançon, Université de Franche-Comté, 41 bis avenue de l'Observatoire, BP 1615, 25010 Besançon Cedex, France

(Received 25 March 2002 / Accepted 24 May 2002)

Abstract
Close coupling (CC) calculations of pure rotational excitation rates of H 2O by para-H 2 are performed between 5 K and 20 K. Some discrepancies with Phillips et al. (1995, 1996) are found and explained. We find that the presence of resonances greatly influences the excitation rates at very low temperature. Fits of our collisional rates are provided.


Key words: molecular data -- molecular processes

Offprint request: M.-L. Dubernet, mld@obs-besancon.fr




© ESO 2002

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