X-ray emission produced by interaction of slow highly charged <inline-formula><tex-math id="Z-20210923142604">\begin{document}${\boldsymbol{ {\rm{O}}^{q+}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="19-20210757_Z-20210923142604.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="19-20210757_Z-20210923142604.png"/></alternatives></inline-formula> ions with Al surfaces

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Abstract

The interaction of highly charged ions with solid surfaces is a very complex multi-body process. When the ions are close to the solid surfaces, the potential energy of the ions will be deposited in a tiny area of the target surfaces in a short time and then emitting X rays, which has important scientific significance and application in Astrophysics and plasma diagnosis. For experiments on the interaction of highly charged ions with surfaces, not only the X-ray energy spectrum but also the X-ray yield should be measured accurately. The precise measurement of the X-ray yield depends on the ability to accurately measure the beam-current intensity. In the past, the beam-current intensity was acquired by measuring the target current. Since the interaction between highly charged ions and solids involves the emission of secondary electrons, the actual measured target current is the sum of the initial beam-current intensity and the intensity caused by the secondary electrons, resulting in inaccurate X-ray yield calculations. In this experiment, a new analytical device, beam-current density meter, has been designed, which can measure the beam-current intensity with an accuracy of 0.1 nA. By measuring the current on the density meter instead of the target current, the influence of secondary electrons is almost avoided, and a more accurate X-ray yield is obtained. This paper reports the characteristic X-ray spectra of oxygen atoms emitted from the interaction of 1.5–20 keV/ qhighly charged ${\rm{O}} ^{q+} $ ions with aluminum surfaces. For the X rays emitted by $ {\rm{O}}^{q+} $ ( q= 3, 5, 6) ions, the experimental results show that it is due to the close collisions with aluminum atoms after entering the surfaces, while the X rays emitted by ${\rm{O}} ^{7+} $ ions mainly come from the decay of hollow atoms. Under the condition of equal kinetic energy, the X-ray yield of ${\rm{O}} ^{7+} $ ions with K-shell vacancy is about one order of magnitude higher than that of $ {\rm{O}}^{q+} $ ( q= 3, 5, 6) ions, and X-ray yield of $ {\rm{O}}^{6+} $ ions without K-shell vacancy is also significantly higher than that of ${\rm{O}} ^{3+} $ and $ {\rm{O}}^{5+} $ ions. Generally, the X-ray yield and ionization cross-section is associated with the initial electron configuration of incident ions, and increases with the growth of ions kinetic energy. Based on the semi-classical approximation theory of binary collision, we have estimated the kinetic energy threshold for the emission of the K _α-X rays of $ {\rm{O}}^{q+} $ ( q= 3, 5, 6) ions as interacting with the aluminum target. As the incident kinetic energy is lower than the kinetic energy threshold, for ${\rm{O}} ^{6+} $ ions interacting with the sample, there may have a multi-electron excitation process that induces this K-electron ionization of the incident ions.

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Corresponding author:Song Zhang-Yong,songzhy@impcas.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11675279, 12075291)

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Vol. 70, Issue 19 - 2021-10-05

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