ISOTOPE EFFECT IN DISSOCIATIVE ADSORPTION OF O2 ON AG(111)

被引：20

作者：

REIJNEN, PHF

RAUKEMA, A

VANSLOOTEN, U

KLEYN, AW

机构：

[1] FOM-Institute for Atomic and Molecular Physics, 1098 SJ Amsterdam

来源：

SURFACE SCIENCE | 1991年 / 253卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(91)90578-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：

A study of dissociative adsorption/recombinative desorption of O2 on Ag(111) is presented. Adsorption is performed at high pressure with a mixture containing isotopically labeled O-16(2) and O-18(2) molecules. Desorption is induced using the method of temperature-programmed desorption. The results show that the dissociative sticking probability for O-16(2) is 1.4 times the dissociative sticking probability for O-18(2), independent of coverage. This surprising effect is interpreted as a signature of stretching of the molecule through an activation barrier into a classically forbidden region.

引用

页码：24 / 32

页数：9

共 32 条

[1] ADSORPTION AND DESORPTION-KINETICS WITH NO PRECURSOR TRAPPING - HYDROGEN AND DEUTERIUM ON W(100) [J].