中国物理B ›› 2013, Vol. 22 ›› Issue (11): 113402-113402.doi: 10.1088/1674-1056/22/11/113402

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

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

周贤明a, 赵永涛a, 任洁茹a b, 程锐a, 雷瑜a, 孙渊博a, 徐戈a b, 王瑜玉a, 刘世东a b, 肖国青a   

  1. a Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2013-03-27 修回日期:2013-05-15 出版日期:2013-09-28 发布日期:2013-09-28
  • 基金资助:
    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).

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   

  1. a Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-03-27 Revised:2013-05-15 Online:2013-09-28 Published:2013-09-28
  • Contact: Zhao Yong-Tao E-mail:zhaoyt@impcas.ac.cn
  • Supported by:
    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).

摘要: 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.

关键词: highly charged ions, charge state effect, inner-shell ionization, X-ray emission

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.

Key words: highly charged ions, charge state effect, inner-shell ionization, X-ray emission

中图分类号:  (Atomic excitation and ionization)

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