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Momentum transfer dependence behaviors of ionization and dissociation of oxygen |
Lin Mei (林梅)a, Liu Ya-Wei (刘亚伟)a, Zhong Zhi-Ping (钟志萍)b, Zhu Lin-Fan (朱林繁)a |
a Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; b School of Physical Sciences, University of the Chinese Academy of Sciences, P. O. Box 4588, Beijing 100049, China |
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Abstract The decay pathways of structured ionization region of oxygen at different momentum transfers, i.e., 0, 0.23 a.u. (atomic unit), and 0.91 a.u., are studied by measuring the ion and the scattered electron coincidently. It is found that the dipole-forbidden superexcited states of (2σu)-1(c4Σu-)npσu 3Σg-≤←X3Σg- decay into different channels according to the principal quantum number n. The broad ridge above 35 eV, which may be due to inner-valence excited states of (2σg)-1nλ or multiply excited states, is observed both at small and large momentum transfers, and its decay channel of O++O is dominant.
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Received: 10 June 2012
Revised: 23 July 2012
Accepted manuscript online:
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PACS:
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34.80.Gs
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(Molecular excitation and ionization)
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33.80.Eh
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(Autoionization, photoionization, and photodetachment)
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32.70.Cs
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(Oscillator strengths, lifetimes, transition moments)
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33.20.Ni
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(Vacuum ultraviolet spectra)
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Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 10734040, 11274291, 10979040, and 11074299); the National Basic Research Program of China (Grant No. 2010CB923301); the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103402110027); and the Fundamental Research Funds for the Central Universities, China. |
Corresponding Authors:
Zhu Lin-Fan
E-mail: lfzhu@ustc.edu.cn
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Cite this article:
Lin Mei (林梅), Liu Ya-Wei (刘亚伟), Zhong Zhi-Ping (钟志萍), Zhu Lin-Fan (朱林繁) Momentum transfer dependence behaviors of ionization and dissociation of oxygen 2013 Chin. Phys. B 22 023404
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