Fully adiabatic interpretation of fine-structure changing transitions in collisions of alkali atoms in2P electronic states with noble gas

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Abstract
The authors present in detail a fully adiabatic description of Na(32P)-He and Na(32P)-Ar collisions. The study reveals the presence in the long-range region of a strong non-adiabatic parity-dependent coupling. This parity-dependent coupling makes an important contribution to the intramultiplet transition cross section, is the origin of the dissimilar energy dependence of the Na-He and Na-Ar cross sections, and contributes to the sigma +/ sigma - asymmetry observed in the scattering of oriented alkali 2P atoms with noble gases.