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Fine-structure transitions in the exit channel of K+Ar optical collisions

We study K+Ar collisions by laser excitation of the collision pair in a differential scattering experiment. The relative population of the K(4p)2P fine-structure sublevels reflects the nonadiabatic coupling in the convergence region of the interaction potentials and illustrates the energy dependence of the nonadiabatic transition probability. Close coupling scattering calculations show a very good agreement with the experimental results, indicating a corresponding accuracy of the available potential data. The spin-orbit interaction in the coupling region is found to be not significantly different from the free atom value.