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Experimental results on fine-structure transitions occurring in collisional redistribution of far---off-resonant radiation are presented. Measurements on Na-Ar atomic collisions illustrate that electronically nonadiabatic transitions occurring in the final state, following absorption, are important for describing the redistribution process. The results also provide details of the fine-structure transition process that are not obtainable from the usual resonant scattering experiments.
Havey et al. (Mon,) studied this question.