Near-threshold photoionization of krypton and xenon has been studied, in the region of the 4s and 5s satellite states respectively. Photoelectron spectra for various constant values of photoelectron energy, from 0-1 eV, have been measured under high resolution revealing a rich structure due to satellite states. Partial ionization cross sections for many of the satellite states, up to 3 eV above their respective thresholds, have been obtained which demonstrate that the mechanism for satellite excitation is a two-step process via doubly excited neutral states or resonances.
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Hall et al. (1990) studied this question.
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