Abstract
An expression for the inelastic collision cross section σ (lm→l′m′) has been derived for the rotational transition in the HD molecule caused by a collision with an inert gas atom. The interaction potentials for the HD systems have been derived from the theoretical potentials for the H2 systems by shifting the center of mass of the molecule. The rotational relaxation number values have been calculated for HD–He, HD–Ne, and HD–Ar systems in the temperature range from 10 to 100 °K. A good agreement has been obtained between theory and experiment. Temperature dependence and the effect of replacement of an isotope in a homonuclear molecule have been discussed in detail.
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