Volume 408, Number 3, September IV 2003
|Page(s)||1197 - 1203|
|Section||Atomic, molecular, and nuclear data|
|Published online||17 November 2003|
Collisional excitation rates of H2O with H2
II. Rotational excitation with ortho-H2 at very low temperature and application to cold molecular clouds
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
2 LERMA FRE 2460, Observatoire de Paris, Section de Meudon, 5 place Janssen, 92195 Meudon Cedex, France
3 Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la Piscine, BP 53, 38041 Grenoble Cedex 9, France
Corresponding author: M.-L. Dubernet, email@example.com
Accepted: 12 June 2003
We present the results of close coupling calculations of pure rotational excitation rate coefficients of H2O by ortho-H2, performed between 5 K and 20 K. At 20 K there is a good agreement with those results obtained previously by Phillips et al. (1996). Fits of our de-excitation collisional rate coefficients are provided. These new rate coefficients are used in the modelling of cold interstellar clouds to determine the influence of the precision of the rate coefficients on predicted line intensities.
Key words: molecular data / molecular processes / ISM: molecules
© ESO, 2003
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