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This paper deals with the treatment of quantum interferences in thesemiclassical initial value theory of rotationally inelastic scattering in theinteraction picture [C. W. McCurdy and W. H. Miller, J. Chem. Phys. 67, 463(1977)]. It is shown that substituting the original phase index by a new oneextends the range of applicability of the theory. The resulting predictions arein close agreement with exact quantum scattering results for a model ofatom-rigid diatom collision involving strong interferences. The developmentsare performed within the framework of the planar rotor model, but they arereadily applicable to the three-dimensional case.

Semiclassical initial value theory of rotationally inelastic scattering: Some remarks on the phase index in the interaction picture