Abstract
The classical equivalent of the quantal IOS approximation for rotationally inelastic atom-molecule collisions is derived. A detailed comparison of integral and differential cross sections with exact classical trajectory calculations for the model He-Na 2 potential V( R,γ) = AR −8[1 + εP 2 (cos γ)] shows very good agreement. Such a comparison can be used as a test of the validity of the IOS assumptions for systems, which do not yet allow a direct comparison between exact and IOS quantal results. The generic structure of the classical differential cross sections is discussed and compared with the IOS results. Furthermore, the validity of the IOS factorization formula for initially rotationally excited molecules is tested. Good agreement is found.
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