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Excitation energy dependence of core-level x-ray-photoemission-spectra line shapes in metals



John William Gadzuk, M Sunjic


Creation of a deep localized hole in the process of x-ray photoemission from metals is followed by a drastic rearrangement of the surrounding electrons in the Fermi sea. This rearrangement in which low-energy electron-hole pairs are produced, in analogy with gas-phase atomic shake-up processes, gives rise to a low-energy tail in the hole spectral density with an integrable (Mahan) singularity at the energy corresponding to zero-energy pair production. When the usual (symmetric) broadening of the hole is included, the resulting hole line shape becomes a skew resonance, with the asymmetry indices growing with the strength of the electron-hole interaction. The case in which the hole potential is switched on instantaneously (the sudden or impulse limit) has been treated by Doniach and Sunjic-acute. However, the potential switching-on time is a function of the speed at which the excited electron leaves the region of the hole. In this paper we calculate the skew line shapes for finite hole-creation times, going continuously from the adiabatic to sudden limits. The photoemission line shape, for a given hole state, varies smoothly from the symmetric result given in the adiabatic approximation to the asymmetric result of Doniach and S-caronunjic-acute obtained in the sudden approximation, as the photon energy is increased above the photoionization threshold value.
Physical Review B (Condensed Matter and Materials Physics)


Gadzuk, J. and Sunjic, M. (1975), Excitation energy dependence of core-level x-ray-photoemission-spectra line shapes in metals, Physical Review B (Condensed Matter and Materials Physics) (Accessed December 2, 2023)
Created July 14, 1975, Updated October 12, 2021