Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..503m&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
NH3 is very abundant in interstellar clouds and is considered as a good temperature diagnostic. Its di- and tri-deuterated forms were recently detected in IRAM and in CSO (Lis, Roueff et al., ApJ, 571, L55, 2002) in cold and dense cores with a spectacular isotopic enrichment. The knowledge of rotational excitation rates by collision with H2 and He is required to interpret properly the observations. We propose to calculate cross sections and collision rates with He and H2 of NH3, ND3, NH2D, ND2H. Here we present theoretical results on rotational excitation of NH3 by He. We can compare them with previous works which were done with different treatments and potential energy surfaces. This comparison is impossible for the deuterated forms. We have used a full close coupling treatment with the molecular collision code of S. Green and J.M. Hutson, MOLSCAT and a recent molecular potential surface calculated by Hodges and Wheatley (J. Chem. Phys, 114, 8836, 2001).
Machin Léandre
Roueff Evelyne
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