The effect of crystalline structure on molecular effect in ion-induced electron emission

被引：0
|
作者：
Andrianova, N. N. [1 ]
Borisov, A. M. [1 ]
Mashkova, E. S. [1 ]
Nemov, A. S. [1 ]
Parilis, E. S. [2 ]
机构：
[1] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119991, Russia
[2] CALTECH, Pasadena, CA 91125 USA
来源：
VACUUM | 2008年 / 82卷 / 09期
关键词：
ion-induced electron emission; molecular effect; ion channeling; transparency model;
D O I：
10.1016/j.vacuum.2007.12.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The results of experimental and theoretical study of the molecular effect in ion-induced electron emission from single crystal and polycrystalline materials are presented. It has been found that the electron emission yield gamma(2) under N-2(+) bombardment of a single crystal shows a dependence on ion incidence angle theta, which is analogous to the anisotropy of the yield, under N+ impact. The ratio R-2(theta)=gamma(2)/2 gamma(1)< 1 exhibits, for single crystals, a drastic angular dependence, which was successfully described on the basis of electron sweeping-out mechanism by conjunction of both the sharp channeling at theta <psi(L) and the shadowing-caused bell-like pattern at theta >psi(L), the Lindhard angle. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：906 / 910
页数：5
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