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129Xe20+入射Ta靶表面发射的紫外光谱线和X射线谱

UV Spectral Lines and X-ray Spectra Induced by 129Xe20+ Impacting on the Ta Surface

  • 摘要: 利用动能100~500 keV和1.2~6.0 MeV的129Xe20+离子分别入射Ta靶表面, 测量不同速度的入射离子与Ta表面相互作用过程中,激发原子或离子的复杂电子组态间跃迁辐射的光谱线。入射离子动能在100~500 keV范围,测量到Xe原子的多个高里德伯态(其价电子的主量子数分别为n = 15 , 13, 11, 8)分别向低激发态5p5(2P°3/2)6s退激辐射的紫外谱线。分析结果显示,随着入射离子动能的增加,高里德伯态Xe原子谱线的单粒子产额减小。在此碰撞过程中,激发的靶离子光谱线的单粒子产额随入射离子动能的增加而增加。在离子动能增加到1.2~6.0 MeV时,激发的Ta原子Mα1, Mα2特征X射线的单粒子产额随入射离子的动能增加而增加。当入射离子动能为6 MeV时,测量到Xe20+与靶原子Ta碰撞过程中Xe原子的L-X射线谱。

     

    Abstract: Using 129Xe20+ ions with kinetic energy of 100~500 keV and 1.2~6.0 MeV respectively incident on the Ta target, the spectral lines of transition radiation are measured between complex electronic configurations of excited atoms or ions during the interaction of incident ions at different velocities with the Ta surface. The ultraviolet spectral lines of the deexcitation radiation from multiple high Rydberg states to low energy state 5p5(2P°3/2)6s of Xe atoms are measured as the kinetic energy of Xe20+ranges from 100 to 500 keV, the principal quantum number of valence electrons of Rydberg states is n = 15 , 13, 11, and 8, respectively. The results show that as the incident ion velocity increases, the single particle fluorescence yield of the the high Rydberg states spectral line of Xe atoms decreases. During this collision process, the single particle fluorescence yield increases of the spectral lines of the excited target atoms and ions with the increase of the incident ion velocity. When the ion kinetic energy increases to 1.2~6.0 MeV, the single particle yield of the Ta characteristic X-rays (Mα1, Mα2) increases with the velocity of the incident ions. When the kinetic energy of the incident ion is 6 MeV, the L X-ray spectra are measured of the Xe atom during the collision between Xe20+and the target atom.

     

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