Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...460..953m&link_type=abstract
Astronomy and Astrophysics, Volume 460, Issue 3, December IV 2006, pp.953-958
Astronomy and Astrophysics
Astrophysics
6
Ism: General, Ism: Molecules, Molecular Data, Molecular Processes, Scattering
Scientific paper
Context: .Observations of deuterated molecules are useful probes of the physical and chemical conditions in star-forming regions. However their detailed interpretation is hampered by the lack of knowledge of the corresponding collisional rate coefficients. Aims: .We extend our previous study of ammonia collisional excitation by helium to monodeuterated ammonia NH2D, which has been found to be abundant in a variety of environments. Methods: .We introduce the principal isotopic effects in the collisional equations by calculating the relevant angular dependence of the intermolecular potential energy surface. Results: . Cross sections are calculated in the coupled states approximation, and collisional rate coefficients are given from 5 to 100 K, a range of temperatures that is relevant in the interstellar medium. Conclusions: .These results allow to include justifiable collisional excitation rate coefficients of NH2D by He in the analysis of the emitted radiation for the first time
Machin Léandre
Roueff Evelyne
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