The validity of the power gap model to fit rotationally inelastic integral cross sections is investigated for the systems Hendash;Na2and Nendash;Na2for which pronounced rotational rainbow features have been reported in previous studies. The theoretical data suggest that a two parameter model is necessary to describe the regions of low and high transitions simultaneously. The branching occurs at the transition from the classically allowed to the classically forbidden (E, Dgr;E) region.
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