Theory of negative-ion conversion of neutral atoms in grazing scattering from alkali halide surfaces

被引:66
作者
Borisov, AG
Sidis, V
机构
[1] Laboratoire des Collisions Atomiques et Moléculaires (Unité associée au CNRS, URA 281), Université Paris-Sud, F-91405 Orsay Cedex
来源
PHYSICAL REVIEW B | 1997年 / 56卷 / 16期
关键词
D O I
10.1103/PhysRevB.56.10628
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The theoretical approach proposed by Borisov et al. [Phys. Rev. Lett. 77, 1893 (1996)] to treat negative-ion conversion of neutral atoms at ionic crystal surfaces is described in detail. Due to the localization of the valence-band electrons at the anionic sites of the crystal, the conversion process is viewed as a result of successive binary collisions between the projectile and the negatively charged sites at the surface. Parameter free calculations of F- formation in grazing scattering from LiF(100) and KI(100) are performed using a model in which all sites of the crystal lattice but one, the active site, are represented by eventually polarizable point charges. Parallel velocity thresholds for negative-ion formation, relative efficiency of the negative-ion formation for LiF and KI crystals, and dependences of this efficiency on the scattering angle correspond well to the experimental results. [S0163-1829(97)08635-9].
引用
收藏
页码:10628 / 10643
页数:16
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