Helium scattering from O on Rh(111): Scattering cross sections and adsorption kinetics

被引：13

作者：

Peterlinz, KA

Sibener, SJ

机构：

[1] UNIV CHICAGO, JAMES FRANCK INST, CHICAGO, IL 60637 USA

[2] UNIV CHICAGO, DEPT CHEM, CHICAGO, IL 60637 USA

来源：

SURFACE SCIENCE | 1995年 / 344卷 / 03期

基金：

美国国家科学基金会;

关键词：

adsorption isotherms; adsorption kinetics; atom solid interactions; atom solid scattering and diffraction elastic; chemisorption; rhodium;

D O I：

10.1016/0039-6028(95)01007-6

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：

He diffraction and specular He scattering measurements of O on Rh(111) were made for T-S=125-625 K and theta(O)=0.0-0.50 ML. For T-S>450 K and theta(O)<0.21 ML, specular He scattering from the O/Rh(111) overlayer is well described by a model for disordered adsorbates, with a cross section of 62.6 Angstrom(2) for 63 meV He. At higher coverages, these measurements reveal a complex relationship between coverage, temperature, and the ordered overlayer structures for O/Rh(111). In addition, adsorption isotherms presented here show second order Langmuir adsorption kinetics for O-2 on Rh(111) and a sticking coefficient of about 5% for O-2 on 525 K Rh(111).

引用

页码：L1239 / L1244

页数：6

共 24 条

[1] MECHANISMS OF CATALYTIC CARBON-MONOXIDE OXIDATION ON PT (110) [J].