ANGULAR ANISOTROPY OF SURFACE MULTIPLE-SCATTERING - ANALYSIS OF CARBON CONTAMINATION ON AN IR(110) SURFACE

被引：4

作者：

BU, H ^{[1
]}

TEPLOV, SV ^{[1
]}

ZASTAVNJUK, V ^{[1
]}

SHI, M ^{[1
]}

RABALAIS, JW ^{[1
]}

机构：

[1] DONETSK STATE UNIV,DEPT PHYS,DONETSK 340055,UKRAINE,USSR

来源：

SURFACE SCIENCE | 1992年 / 275卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0039-6028(92)90805-G

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Multiple scattering (MS) effects resulting from the successive collisions of 4 keV Ar+ with iridium and carbon atoms were investigated on a carbon contaminated Ir{110} surface. The experimental measurements were made at different crystallographic directions. The results show that (i) detection of MS provides an extremely sensitive method for monitoring the surface contamination and (ii) the MS intensity exhibits strong anisotropies as a function of incident angle (alpha), azimuthal angle (delta), and scattering angle (THETA). Combined with Monte Carlo computer simulations, the MS angular anisotropies allow an identification of the scattering and recoiling processes and provide unique structural information regarding the location of the carbon impurities on the surface. The experimental results and simulations are consistent with carbon impurity sites located inside the [110BAR] troughs and above the surface. The carbon coverage is estimated to be approximately 0.5 ML.

引用

页码：332 / 338

页数：7

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