The relationship between the velocity vectors of a gas-phase molecule before and after a collision is given by the differential cross section. Optical-optical double-resonance experiments using highly coherent sources can be used to obtain this information. Predictions and experimental considerations are discussed, and data are presented for elastic scattering in the υ=18, $j=13$ level of A¹Σᵤ⁺-state Li₂ by Xe atoms.
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McCaffery et al. (1988) studied this question.
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