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Polarizabilities and photoionization cross sections of OH and HF.

Polarizabilities and photoionization cross sections are computed for the hydrides OH and HF. Finite basis sets are used, with no explicit recourse to continuum orbitals, and single-center expansions are avoided. The present method is based on an integral equation (dispersion relation) that relates the real polarizability on the imaginary frequency axis to the photoionization cross section. Many-body perturbation theory is used to compute the polarizabilities, and the perturbation expansion, which includes a total of 68 distinct diagrams to second order in the Coulomb interaction, is believed to contain all significant terms to that order