Crossed molecular beam-tunable laser determination of velocity dependence of intramultiplet mixing: K(4p2P1/2)+He →K(4p2P3/2)+He

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Abstract
The velocity dependence of intramultiplet mixing, K(4p2P1/2) +He→K(4p2P3/2)+He, has been measured over the relative velocity range v=1.3–3.4 km/sec. The cross section appears to fit a linear function Q (v) =A (v−v0), where a=6.3×10−4 Å2 and v0= 7.9×104 cm/sec. The value of A is obtained by normalization to the literature thermal average cross section. The intramultiplet mixing theory of Nikitin is modified to yield Q (v) for the process. The modified theory correctly exhibits detailed balancing, and it is normalized to provide a very good fit to the observed Q (v). The magnitude of the normalization factor, however, is larger than that predicted from recent pseudopotential calculations of the excited state potentials. The temperature dependence of intramultiplet mixing is predicted. The use of laser polarization to determine the mj dependence of the process K(4p2P3/2+He→K(4p2P1/2)+He and other collision processes of excited 2P3/2 states is examined.

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