Semi-classical analysis of weakly inelastic molecular collisions

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Abstract
Semi-classical analysis is applied to vibrationally and rotationally inelastic molecular collisions. The deflection angles for weak transitions are shown to be simply related to the classical deflection angles for elastic scattering under the initial and final conditions. The position of the crossing-point, at which the transition can occur without change of radial momentum, plays an important role in the discussion and expressions are derived for these points for systems undergoing rotational transitions. Finally it is shown that markedly inelastic behaviour recently observed in collisions between K and HBr is unlikely to arise from rotational transitions.

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