A formula was obtained that describes asymptotically forbidden quasimolecular optical transitions in the frame of the semiclassical approach. It is particularly relevant for the weak extrema in the difference between the ground-and excitedstate interaction potentials. When averaged over impact parameters and velocity distribution the formula agreed reasonably well with the recent experimental data for the Ca(4 1 S → 3 1 D) + He transition.
A quasiclassical analysis of the differential inelastic scattering of oriented Ca(4s5 p, 1 P 1 ) atoms on He at a collision energy of 1 eV is presented. Inelastic channels correspond to spin-changing events populating different Zeeman sublevels of three fine-structure states of Ca(4s5p, 3 P j ), jϭ0, 1, and 2. The magnitude of the right-left scattering asymmetry in the helicopter plane is shown to depend on the locking dynamics. The relative values of different Zeeman-specific cross sections are determined by the diffraction scattering on the attractive 1 ⌸ state in the entrance channels, by the Coriolis mixing between degenerate components of the repulsive 3 ⌺ ϩ intermediate state, and by the radial coupling between 1-1 and 0 Ϫ -0 Ϫ fine-structure components of the 3 ⌺ ϩ -3 ⌸ ⍀ states in the exit channels. The predicted large right-left scattering asymmetry suggests that it can be measured experimentally.
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