^(126)Xe^(q+)轰击Al表面产生的原子和离子光谱线

Atomic and Ion′s Light Emission Spectra Induced by the Impact of ^(126)Xe^(q+) on Al Solid Surface

报道了高电荷态离子12 6Xeq + (6≤q≤ 30 )入射到固体Al表面产生的 2 0 0～ 10 0 0nm波段的发射光谱的实验结果。实验表明 ,在弱束流 (nA量级 )高电荷态的情况下 ,通过入射离子与固体靶的相互作用可有效地产生原子和离子的复杂组态间跃迁所形成的可见光波段的特征谱线 ,而且当入射离子的电荷剥离数超过一临界值后 (对Al,q=2 6 ) ,谱线相对强度突然显著增强。根据经典过垒模型COB(Theclassicover barriermodel) ,在入射离子的动能较小 (～ 1keV/u)的条件下 ,高电荷态离子与表面相互作用过程中电子的俘获或转移起着非常重要的作用 ,通过提高入射离子的电荷态可增强入射离子俘获电子的能力 ,显著增强激发粒子的光谱线的强度。

The measurement of light spectrum with wavelength from 200 nm to 1000 nm emitted from solid surface of Al which is excited by slow highly charged ions 126 Xe q+ (6≤q≤30) is reported. The result shows that the characteristic spectral lines from transitions between complex configurations of atoms and ions can be effectively excited by the impact of highly charged ions on a solid surface even though the ionic beam is very weak. The relative intensity of those spectra can be enhanced sharply and greatly if the stripped charge q of incident ions (q) is beyond a critical value (q=26 for Al). According to the classic over-barrier modek, electrons captured and transferred play key roles in interaction between highly charged ions and solid surfaces if the kinetic energy of the incident ions is small (～1 keV/u). The ability of ions capturing electrons can be intensified by increasing charged states of the incident ions, therefore, the light spectra intensity of excited particles can be enhanced significantly.