Abstract
The authors report new electron momentum spectroscopy (EMS) measurements on hydrogen fluoride (HF) and neon (Ne) at 1500 eV. The present HF data for the 1 pi , 3 sigma and 2 sigma orbitals are compared in detail with the results of an earlier EMS study at 400 and 1200 eV and with the results of a recent calculation of the valence orbital momentum distributions given by (i) SCF calculations at the Hartree-Fock limit and (ii) CI calculations of the complete molecule-ion overlap amplitude. The current Ne 2p and 2s momentum distributions are compared with the results of both the plane wave and a new, fully distorted wave Born approximation (DWBA) calculation. The results of the DWBA calculation in Ne have direct relevance to HF, in particular to the inner valence (2 sigma ) cross section.
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