Charge state effect on the K-shell ionization of iron by xenon ions near the Bohr velocity

doi:10.1088/1674-1056/22/11/113402

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 (Z_eff) 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 (Z_eff) correction for the BEA model. It is found that Z_eff 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 Z_eff corrected BEA model is unable to explain the inner-shell ionization, and the electron transfer by molecular-orbital promotion should be considered.

Keywords: highly charged ions charge state effect inner-shell ionization X-ray emission

Received: 27 March 2013
Revised: 15 May 2013
Accepted manuscript online:

PACS:	34.80.Dp	(Atomic excitation and ionization)
	32.30.Rj	(X-ray spectra)
	32.80.Aa	(Inner-shell excitation and ionization)

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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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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Charge state effect on the K-shell ionization of iron by xenon ions near the Bohr velocity

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