Photoelectron photoion coincidence measurements of selenium cluster beam. II. Photon energy dependence

被引:13
作者
Hayakawa, T [1 ]
Nagaya, K [1 ]
Hamada, K [1 ]
Ohmasa, Y [1 ]
Yao, M [1 ]
机构
[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan
关键词
selenium; cluster; PEPICO; multiply-charged ion; Coulomb explosion; resonance absorption; XAFS;
D O I
10.1143/JPSJ.69.2850
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The photon energy dependence of the photoelectron photoion coincidence (PEPICO) spectra near the Se K-edge have been measured for Se-2 and larger species such as Se-5 at the BL-12C in Photon Factory. The PEPICO spectra reveal that the multiply charged ions, Sez+, are produced as a result of the de-excitation process following the inner-shell excitation. Two prominent structures corresponding to the pi* and sigma* resonances are clearly observed in the energy dependence of the branching ratio from Se-2, while only one structure corresponding to the sigma* resonance can be seen for the larger species. At the sigma* resonance, the production of Se+ and Se2+ is enhanced, in comparison with the direct ionization where the core-hole states are completely relaxed before the dissociation. The energies of the pi* and sigma* resonance relative to the Is ionization potential are estimated at - 10.0 +/- 0.5 eV and -5 +/- 1eV, respectively. In addition, we propose a new method for the size-selective structural analysis of clusters by utilizing the PEPICO measurements.
引用
收藏
页码:2850 / 2858
页数:9
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