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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.
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.
Chandra, I.,Kim, S.,Seto, T.,Otani, Y.,Takami, A.,Yoshino, A.,Irei, S.,Park, K.,Takamura, T.,Kaneyasu, N.,Hatakeyama, S. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.141 No.-
<P>Field observations to investigate the correlation between New Particle Formation (NPF) and the long-range transport of air pollutants in the East Asia region were carried out on a rural Island of Japan in the East-China Sea (Fukue Island, 32.8 degrees N, 128.7 degrees E) over three periods (February 23 to March 7, 2013; November 7 to 20, 2013; and November 2 to 24, 2014). Frequent NPF events were identified (16 events in 50 days), typically in association with sudden increases in particle number concentrations and the successive growth of particles to mobility diameters of several tens of nanometers. The NPF events were classified into two types (A and B) according to the initially detected particle sizes (onset diameters). Type-A consisted of strong NPF events with onset diameters as small as 5 nm. Type-B consisted of NPF events whose onset (<10 nm) was not clearly identifiable. The correlations of SO2 concentrations, solar radiation, PM2.5 concentrations, and chemical composition were analyzed based on the types of NPF events. (C) 2016 Elsevier Ltd. All rights reserved.</P>