Abstract
The yield spectra of Xe2+ and Xe3+ ions near the 4d ionization limits have been measured by a threshold electron-photoion coincidence method. These spectra consist of some prominent peaks corresponding to the 4d-1np Rydberg states and two dominant peaks corresponding to 4d threshold ionization. It is proposed that threshold-electron emission from the inner-shell resonance states is due to not only shake-off (e.g. Xe 4d-16p to Xe2+ 5p-2) but also two-step autoionization (e.g. Xe 4d-16p to Xe+ 5s-15p-17p to Xe2+ 5s-15p-1). The two-step autoionization process plays an important role in decays from the lower n Rydberg states. Two dominant peaks somewhat above the 4d ionization limits show the effect of post-collision interaction, namely, shifts of peak positions and asymmetric profiles. The shifts are almost the same in the Xe2+ and Xe3+ spectra.
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