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Astron. Astrophys. 343, 1005-1008 (1999)

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Rotational excitation of HD molecules by He atoms

E. Roueff and C.J. Zeippen

UMR 8631 (associée au CNRS et à l'Université Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France

Received 2 December 1998 / Accepted 23 December 1998


We present rate coefficients for rotational transitions induced in collisions between HD and He. Rotational levels and kinetic temperatures T [FORMULA] 1000 K are considered. The interaction potential surface calculated by Muchnick & Russek (1994) has been used, together with the quantal coupled-channel method for calculating the cross-sections. Very good agreement with previous calculations by Schaefer (1990) is obtained. The present work goes beyond the latter in that collision rates are calculated for all available rotational levels below the first excited vibrational level.

Key words: molecular data – molecular processes – ISM: molecules

Send offprint requests to: E. Roueff

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999