Abstract
Calculations of the photoionization cross section corresponding to the X 2Π (5pπ) −1 ion state and of the angular asymmetry parameter β are performed for the HI molecule in the 10.4–92 eV range. Within the frozen-core static exchange approximation, no Cooper minimum is found in the cross section, contrary to experiment. Interchannel coupling with the continuum states corresponding to ion states associated with a 4d hole is also partially taken into account. Two energy points are calculated within this coupling scheme, showing better agreement with experiment, especially for β at high energies.
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