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We report the experimental data of characteristic X-ray spectra produced by the impact of H+, Ar8+, Ar12+, Kr13+ and Eu20+ ions with different kinetic energies on Au surface in the National Laboratory of Heavy Ion Research Facility in Lanzhou, China. The energy shifts of X-ray spectra are analyzed and the ratio of X-ray yield is calculated. The results show that H+ can excite the characteristic X-ray spectra of Mζ and Mα of Au, while Ar8+, Ar12+, Kr13+ and Eu20+ can excite the characteristic X-ray spectra of Mζ, Mα, Mγ and Mδ of Au, because the inner shells of target atom are multiply ionized by heavy ions impact, so that the relative intensity ratio of the X-rays changes when the heavy ions are incident. There are different energy shifts of Au M X-ray due to multiple ionization effect in collision. When the ion incident energy is lower, the degree of multiple ionization of the inner shells of the target atom is almost independent of the incident energy, when the ion energy is higher, the degree of multiple ionization increases with incident ion energy increasing. At the same time, the degree of multiple ionization also depends on the number of holes in the outer shell of the ion and its atomic number. That the ratio of X-ray yield increases with the increase of the atomic number of the incident ion further indicates that the degree of multiple ionization increases with atomic number of the incident ion increasing. The multiple ionization and electron configuration of the inner shells of the atom can be determined by the energy shift and spectra broadening. These measurements provide basic data for further studying the multiple ionization mechanism of the inner shells of the atom. But due to the limitation of the resolution of the detector, the spectral broadening data cannot be measured. It is necessary to use a higher-resolution detector to further study the multi-ionization effect of the inner shells of the atom.
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Keywords:
- heavy ions /
- X-ray /
- energy shift /
- multiple ionization effect
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[1] Czarnota M, Bana D, Braziewicz J, Semaniak J, Pajek M, Jaskola M, Korman A, Trautmann D, Kretschmer W, Lapicki G, Mukoyama T 2009 Phys. Rev. A 79 032710
[2] Zhang X A, Zhao Y T, Hoffmann D H H, Yang Z H, Chen X M, Xu Z F, Li F L, Xiao G Q 2011 Laser Part. Beams 29 265
[3] Zhao Y T, Xiao G Q, Zhang X A, Yang Z H, Zhan W L, Chen X M, Li F L 2006 Nucl. Instrum. Melth. B 245 72
[4] Singh Y, Tribedi L C 2002 Phys. Rev. A 66 062709
[5] Chen X M, Jiang L J, Zhou P, Zhou C L, Gao Z M, Qiu X Y, Cui Y, Wang X A, Lou F J, Lü X Y, Jia J J, Chen L, Shao J X, Lü Y, Wang F 2011 Chin. Phys. B 20 013402
[6] Wang X, Zhao Y, Cheng R, Zhou X M, Xu G, Sun Y B, Lei Y, Wang Y Y, Ren J R, Yu Y, Li Y F, Zhang X A, Li Y Z, Liang C H, Xiao G Q 2012 Phys. Lett. A 376 1197
[7] Ghanbari-Adivi E, Eskandari S 2015 Chin. Phys. B 24 013401
[8] Mei C X, Zhang X A, Zhao Y T, Zhou X M, Ren J R, Wang X, Lei Y, Sun Y B, Cheng R, Wang Y Y, Liang C H, Li Y Z, Xiao G Q 2013 Chin. Phys. B 22 103403
[9] Hoffmann D H H, Blazevic A, Korostiy S, Ni P, Pikuz S A, Rethfeld B, Rosmej O, Roth M, Tahir N A, Udrea S, Varentsov D, Weyrich K, Sharkov B Y, Maron Y 2007 Nucl. Instrum. Meth. Phys. Res. Sec. A 577 8
[10] Sharkov B 2001 Plasma Phys. Control. Fusion 43 A229
[11] Zhou X M, Zhao Y T, Ren J R, Cheng R, Lei Y, Sun Y B, Xu G, Wang Y Y, Liu S D, Xiao G Q 2013 Chin. Phys. B 22 113402
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