Projectile velocity and target temperature dependence of charge-state distributions of multicharged ions scattered during grazing interactions with a Au(110) surface.
Projectile velocity and target temperature dependence of charge-state distributions of multicharged ions scattered during grazing interactions with a Au(110) surface.
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DOI：
10.1103/physreva.54.641
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发表时间：
1996-07
期刊：
影响因子：
--
通讯作者：
Yan;Zehner;Meyer;Schippers
中科院分区：
文献类型：
--
作者：
Yan;Zehner;Meyer;Schippers
本文对多电荷He、N、Ne、Na和Ar离子掠入射到Au（110）单晶靶上的散射粒子电荷态分布进行了系统的测量。对于射弹的中性结合能低于价带（N，Ar，He和Ne），观察到的1+电荷分数小，在低速和急剧增加以上定义明确的阈值速度。然而，对于中性结合能高于费米能级的Na射弹，发现了一个大的（约84%）1+电荷分数。由于射弹静止坐标系中费米能级以上的电子态的虚布居，Na中性分数的速度依赖性显示出“运动学共振”。测量的样品温度依赖性的散射1+电荷分数的Ne 9+射弹入射沿着[110]表面沟道方向揭示了一个显着的减少，射弹中和一旦（2X 1）-（1X 1）相变温度的Au（110）表面在650 K已经达到。
We have made systematic measurements of scattered projectile charge-state distributions for multicharged He, N, Ne, Na, and Ar ions grazingly incident on a Au(110) single-crystal target. For projectiles whose neutral binding energies Lie below the valence band (N, Ar, He, and Ne), observed 1+ charge fractions were small at low velocities and steeply increased above well-defined threshold velocities. However, for Na projectiles with neutral binding energy above the Fermi level, a large (about 84%) 1+ charge fraction was found. The velocity dependence of the Na neutral fraction shows a ''kinematic resonance'' due to the virtual population of electronic states above the Fermi level in the projectile rest frame. The measured sample temperature dependence of the scattered 1+ charge fraction for Ne9+ projectiles incident along the [110] surface channeling direction reveals a significant decrease in projectile neutralization once the (2X1)-(1X1) phase transition temperature of the Au(110) surface at 650 K has been reached.