Rotational excitation and de-excitation of HF molecules by He atoms

Free access article

Issue		A&A Volume 430, Number 3, February II 2005


Page(s)		1139 - 1142
Section		Atomic, molecular and nuclear data
DOI		http://dx.doi.org/10.1051/0004-6361:20041094

A&A 430, 1139-1142 (2005)
DOI: 10.1051/0004-6361:20041094

Rotational excitation and de-excitation of HF molecules by He atoms

C. Reese¹, T. Stoecklin², A. Voronin² and J. C. Rayez²

¹ Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stanford, CA 94305, USA
² Laboratoire de Physico-Chimie Moléculaire, Université de Bordeaux 1, 351 cours de la Libération, 33405 Talence Cedex, France
e-mail: t.stoecklin@lpcm.u-bordeaux1.fr

(Received 15 April 2004 / Accepted 17 September 2004)

Abstract
We report Close Coupling calculations of the rotational transitions induced in collisions between HF molecules and He atoms. We consider transitions for levels up to J=9 and for temperatures up to 300 K. We use a new global 3D potential energy surface which we proposed recently and is the best available at the moment. This surface exhibits two minima associated both with linear geometries ( V=-43.70 cm ^-1 for He-HF and V=-25.88 cm ^-1 for He-FH). Close Coupling calculations are performed in the collision energy 10 ^-6 to 2000 cm ^-1 interval. Our results validate the estimate, by Neufeld et al., of the abundance of HF in the interstellar medium which was detected recently.

Key words: molecular data -- molecular processes -- ISM: molecules -- ISM: abundances -- astrochemistry

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