Rovibrational excitation of HD molecules by He atoms

Rate coecients for rovibrational transitions induced in HD by collisions with He are presented. Full quantum mechanical treatment has been used with the interaction potential surface calculated by Muchnick & Russek (1994). The vibrationalv =1 ! 0 quenching rates of HD due to various perturbers are compared up to tem- peratures of 1500 K. The influence of vibrationally excited channels on the pure rotational excitation cross sections is shown to be negligible.