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K-shell ionization of 25–100 keV Nq+ (q = 3, 5) ions impinging on Al and Cu surfaces

  • Regular Article – Atomic and Molecular Collisions
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Abstract

In this paper, K-shell X-ray spectra of nitrogen are measured by the interaction of Nq+ (q = 3, 5) ions with Al and Cu surfaces in the impact energy range of 25–100 keV. K-shell X-ray yields per incident ion and then ionization cross sections are deduced from the measured K-X-ray spectra. It is found that both the yields and cross sections increase quickly with increasing impact energy, but have no apparent dependence on the target material and the charge state of the incident ion. The experimental results reveal that the incident Nq+ (q = 3, 5) ions have been neutralized and achieved a charge-state equilibration before the K-shell electron is ionized. The experimental ionization cross sections are compared with those from the plane wave Born approximation (PWBA) and the classical binary encounter approximation (BEA) theory. The BEA calculations are better consistent with the experimental data than the PWBA. It means that the K-shell ionization of the incident Nq+ (q = 3, 5) ions is due to the direct Coulomb excitation processes that occurred below the target surface.

Graphic abstract

K-shell ionization cross sections of Nq+ ions incident on an Al target. The theoretical calculations of BEA and PWBA models are also shown for comparison

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data needed to evaluate the conclusions in this work are present in the paper. Additional raw data are available from the corresponding authors upon reasonable request.]

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Acknowledgements

This work was supported by the National Natural Science Foundation of China through Grant Nos. 12075291 and 11675279.

Funding

National Natural Science Foundation of China (Grants Nos. 12075291, 11675279).

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Authors and Affiliations

  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Bing-Zhang Zhang, Zhang-Yong Song, Cheng Qian, Xing Fang, Chao-Jie Shao, Wei Wang, Jun-Liang Liu, Jun-Kui Xu, Yong Feng, Liang-Ting Sun, Zhi-Hu Yang & De-Yang Yu

  2. School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China

    Bing-Zhang Zhang & Zhi-Chao Zhu

  3. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China

    Xuan Liu, Yan-Ling Guo & Lin Chen

  4. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhang-Yong Song, Cheng Qian, Xing Fang, Chao-Jie Shao, Wei Wang, Jun-Liang Liu, Jun-Kui Xu, Yong Feng, Liang-Ting Sun & De-Yang Yu

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  1. Bing-Zhang Zhang
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Contributions

Z.Y.S., B.Z.Z., and X.L. performed the measurements. Z.Y.S. designed the experiments. B.Z.Z. and Z.Y.S. processed the experimental data, performed the analysis, drafted the manuscript and designed the figures. C.Q., X.F. and L.T.S. arranged and operated the ECRIS. J.L.L. and W.W. designed the beam profile system. C.J.S. helped to operate the X-ray detector. All authors discussed the results and commented on the manuscript.

Corresponding author

Correspondence to Zhang-Yong Song.

Additional information

Supported by the National Natural Science Foundation of China (Grants Nos. 12075291 and 11675279).

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Zhang, BZ., Song, ZY., Liu, X. et al. K-shell ionization of 25–100 keV Nq+ (q = 3, 5) ions impinging on Al and Cu surfaces. Eur. Phys. J. D 76, 49 (2022). https://doi.org/10.1140/epjd/s10053-022-00378-7

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  • DOI: https://doi.org/10.1140/epjd/s10053-022-00378-7

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