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Differential cross section for Na fine-structure transfer induced by Na and K collisions.

The electronic energy-transfer process Na{sup *}(3P{sub 3/2})+{ital M}{r arrow}Na{sup *} (3{ital P}{sub 1/2})+{ital M}, where {ital M} is an Na or K atom, has been measured differentially with respect to scattering angle. This has been done with crossed beams and by establishing the final (3{ital P}{sub 1/2}) state velocity distribution from the Doppler spectrum of 3{ital P}{sub 1/2}{r arrow}4D{sub 3/2} absorption. The differential cross section for Na perturbers is highly forward peaked (within a few degrees) with a small but extended high-angle tail. Forward angles are also dominant for K perturbers, but these cover a larger angular range with a very substantial large-angle contribution.