15. M. Ya Amusia, Electron Correlations in Photoatomic Processes at High Frequencies

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Volume 13: Pages 444-452, 2000

Electron Correlations in Photoatomic Processes at High Frequencies

M. Ya Amusia 1,2

1The Racah Institute of Physics, The Hebrew University, Jerusalem 91904 Israel

2A.F. Ioffe PhysicalTechnical Institute, St. Petersburg 194021 Russia

Electron correlations are important in absorption and scattering of photons by atoms not only at low, but also at relatively high, photon energies. Several mechanisms responsible for this effect are discussed. The results of recent calculations of photoionization cross sections of Ne and Ar atoms at reasonably high photon energies are presented. Electron correlations qualitatively modify the asymptote of the photoionization cross section. Specific features of interelectron correlations in the doubleelectron ionization in photon absorption and scattering are discussed. The results obtained can also be of importance for polyatomic systems.

Keywords: photoionization, twoelectronionization, electron correlations, Compton ionization, quasifree mechanism, “shadow” levels, intershell interaction, asymptotic cross section, radiative capture

Received: June 2, 2000; Published online: December 15, 2008