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A new phase rule for rotationally inelastic diffraction scattering in atom-molecule collisions

A new simple rule has been derived for the shift in phase of rotationally inelastic diffraction oscillations for an atom-homonuclear-diatomic-molecule collision. The new phase rule is more general and accurate than the Blair phase rule (1959). It is obtained by applying semiclassical complex angular momentum techniques to the infinite-order sudden approximation, together with a weak-coupling expansion. Application is made to Ne-D2 rotationally inelastic scattering.