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Formation of Metastable Fragments around the Cl 2p Ionization Thresholds of HCl
Y. Hikosaka,T. Kaneyasu,E. Shigemasa 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Formation of metastable fragments has been investigated in the vicinity of the Cl 2p ionization thresholds of HCl. Efficient productions of H* fragments with their counterpart of Cln+ ions are observed around the ionization thresholds. The formations of H+Cln+ pairs result from the dissociation of high-Rydberg HCl+ states that are populated either by spectator Auger decay from the inner-shell excited states or by the recapture of slow photoelectrons into the Rydberg orbitals. In addition, H* fragments are shown to be produced through the dissociation of HCl2+ states formed via normal Auger decay of the Cl 2p core-hole states.
Stability and Fragmentation of OCS2+ Studied by Using Auger-Electron-Ion Coincidence Measurement
T. Kaneyasu,M. Ito,Y. Hikosaka,E. Shigemasa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
An Auger-electron-ion coincidence method has been applied to investigate dissociation of OCS^2+ states with two valence holes, which are populated via Auger decay following S 2p photoionization of OCS. We found that OCS^2+ states lying around a binding energy of 32 eV are mostly stable against dissociation, which indicates that the potential energy surfaces of these OCS^2+ states have deep wells around the Franck-Condon region. In contrast, the OCS^2+ states lying around 34 eV and 42 eV dissociate predominantly into CO^+ + S^+ and O + C^+ + S^+, respectively.