Collisional pair polarizabilities calculated by exchange perturbation theory using electric field variant basis sets

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Abstract
The use of exchange perturbation theory to calculate collisional pair polarizabilities is investigated. Both conventional and electric field variant basis sets are considered for the cases of helium and hydrogen atom pairs. It is shown that high quality atomic descriptions are required to obtain reliable results from the method. The inclusion of exchange is found to be important and the method leads to closer agreement with Hartree–Fock results than does dipole–induced-dipole theory. The significance of recent configuration interaction calculations for hydrogen and helium atom pairs is also discussed.

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