Abstract
A semiclassical theory is applied to describe collisions between sodium atoms which are independently excited to a specific magnetic sublevel of the 3p state. Cross sections for energy transfer are calculated for different combinations of the initial magnetic quantum numbers (ma,mb) of the atoms, and as a function of the thermal collision velocity. The motion of the cores is described either by curved trajectories, based on non-averaged adiabatic potential curves, or by straight trajectories. The largest basis set used for the electronic wavefunction contains the 4p, 5s, 4d and 4f exit channels. The electronic interaction Hamiltonian is approximated by a multipole expansion, for which all non-vanishing contributions are evaluated.
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