Abstract
We present a uniform semiclassical analysis of the radial coupling A(r)(d/dr) in the adiabatic basis. Various approximations are tested for solving the perturbative form of the probability integrals. Our model is applied to the excitation transfer He(/sup 1/S)+Ne/sup 2/+(/sup 1/D)..-->..He(/sup 1/S)+Ne/sup 2 +/(/sup 1/S). The results we obtain are in good agreement among themselves and provide an alternative model in the adiabatic frame to complete the current Landau-Zener-Stueckelberg--like calculations. The dominating role of the turning points in such curve-crossing problems is also demonstrated.
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