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Rotational excitation of HD molecules by He atoms
E. Roueff and
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 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
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Online publication: March 1, 1999