INTRA-ATOMIC AND INTER-ATOMIC AUGER PROCESSES IN COLLISIONS OF LOW-ENERGY HE++, HE+, HE-STAR (23 S,21 S) AND LI+ WITH LI COVERED W(110) SURFACES

被引:39
作者
BRENTEN, H
MULLER, H
KEMPTER, V
机构
[1] Physikalisches Institut der Technischen Universität Clausthal, Clausthal-Zellerfeld, W-3392
来源
ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS | 1992年 / 22卷 / 03期
关键词
D O I
10.1007/BF01426356
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Electron spectra from He++, He+ and Li+ (10 to 1500 eV) ions colliding under grazing incidence with Li covered W (110) surfaces are reported. The results are compared with those obtained from thermal collisions of (2(3) S; 2(1) S) metastable He atoms. In these collisions 1s vacancies are either produced during the collision event (energetic He+ (Li+) collisions) or are brought into the collision (slow He++ (He+, He*) collisions). Population of the 2s orbitals by two electrons produces states which decay by intraatomic Auger processes: we observe autoionization of He** (2s2) and Li** (1s2s2) as well as autodetachment of He-* (1s2s2). Alternatively the 1s-holes in the projectile or target (Li) can be filled by Auger processes involving one or two surface electrons. The processes leading to electron emission are studied as a function of the Li coverage in the submonolayer region (0 less-than-or-equal-to THETA(Li) less-than-or-equal-to 1 Ml) and as a function of the projectile energy. It is concluded that with one or two 1s vacancies present in the projectile the double capture of two surface electrons constitutes an important process responsible for electron emission of low work function surfaces.
引用
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页码:563 / 568
页数:6
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