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Charge state effect on the K-shell ionization of iron by xenon ions near the Bohr velocity |
Zhou Xian-Ming (周贤明)a, Zhao Yong-Tao (赵永涛)a, Ren Jie-Ru (任洁茹)a b, Cheng Rui (程锐)a, Lei Yu (雷瑜)a, Sun Yuan-Bo (孙渊博)a, Xu Ge (徐戈)a b, Wang Yu-Yu (王瑜玉)a, Liu Shi-Dong (刘世东)a b, Xiao Guo-Qing (肖国青)a |
a Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
b University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Fe K-shell ionization cross sections induced by 2.4–6.0 MeV Xe20+ are measured and compared with different binary-encounter-approximation (BEA) models. The results indicate that the BEA model corrected both by the Coulomb repulsion and by the effective nuclear charge (Zeff) agrees well with the experimental data. Comparison of Fe K-shell X-ray emission induced by 5 MeV xenon ions with different initial charge states (20+, 22+, 26+, 30+) verifies the applicability of the effective nuclear charge (Zeff) correction for the BEA model. It is found that Zeff correction is reasonable to describe direct ionization induced by xenon ions with no initial M-shell vacancies. However, when the M shell is opened, the Zeff corrected BEA model is unable to explain the inner-shell ionization, and the electron transfer by molecular-orbital promotion should be considered.
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Received: 27 March 2013
Revised: 15 May 2013
Accepted manuscript online:
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PACS:
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34.80.Dp
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(Atomic excitation and ionization)
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32.30.Rj
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(X-ray spectra)
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32.80.Aa
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(Inner-shell excitation and ionization)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB832902) and the National Natural Science Foundation of China (Grant Nos. 11275241, 11205225, 11105192, and 11275238). |
Corresponding Authors:
Zhao Yong-Tao
E-mail: zhaoyt@impcas.ac.cn
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Cite this article:
Zhou Xian-Ming (周贤明), Zhao Yong-Tao, Ren Jie-Ru (任洁茹), Cheng Rui (程锐), Lei Yu (雷瑜), Sun Yuan-Bo (孙渊博), Xu Ge (徐戈), Wang Yu-Yu (王瑜玉), Liu Shi-Dong (刘世东), Xiao Guo-Qing (肖国青) Charge state effect on the K-shell ionization of iron by xenon ions near the Bohr velocity 2013 Chin. Phys. B 22 113402
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