Abstract
Multiple photoionization of Xe near the 3d5/2-shell threshold photoionization region is studied by threshold electron–ion coincidence spectroscopy. The coincidence spectra of Xe3+ to Xe7+ ions exhibit characteristic profiles associated with multi-step post-collision interactions in Auger cascades following 3d5/2-shell threshold photoionization. The Auger cascade decay channels leading to the formation of multiply charged ions are deduced from the energies of the profile peaks, which increase gradually with increasing charge state. The formation of Xe3+ to Xe5+ ions is found to arise from cascades of normal Auger decays, whereas the formation of Xe6+ and Xe7+ ions involves double Auger decays. The branching ratio of double to normal Auger decays is estimated to be 0.25 (±0.1) for the decays following the creation of 3d5/2-hole states in Xe.
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