Abstract

Valence double photoionization of Ne atom has been investigated by multielectron spectroscopy. Complete information on energy correlation between ejected electrons allows the identification of ${\mathrm{Ne}}^{2+}$ final states and their formation mechanism. In addition to simultaneous two-electron emission from the valence shells, indirect processes mediated by singly charged excited states have been observed. We have first obtained direct double-photoionization cross sections state-selectively in a wide photon energy region, by evaluating the contributions of the indirect processes. We have also applied the coincidence spectroscopy to three-electron emission from the valence shells. Even in the three-electron emission, the coincidence analysis enables to observe individual ${\mathrm{Ne}}^{3+}$ final states related to the triple-photoionization process and to obtain the state-selective cross sections.

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