CHEMICAL-PROPERTIES OF BIMETALLIC SURFACES - REPULSIVE INTERACTIONS BETWEEN ZN AND S ON RU(001)

被引：10

作者：

KUHN, M ^{[1
]}

RODRIGUEZ, JA ^{[1
]}

HRBEK, J ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973

来源：

SURFACE SCIENCE | 1994年 / 314卷 / 03期

关键词：

D O I：

10.1016/0039-6028(94)90224-0

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：

Results of XPS and XAES indicate that, in spite of the large thermochemical stability of Zn-S compounds, there is no lateral bonding between Zn and S atoms coadsorbed on top of Ru(001). Surfaces with submonolayer coverages of Zn and S, theta(S) + theta(Zn) less-than-or-equal-to 1 ML, show desorption of Zn at temperatures between 600 and 700 K, with S remaining on top of the Ru substrate up to temperatures above 1000 K. The presence of S significantly decreases the desorption temperature of Zn from Ru(001). At O(S) = 0.5 ML, the activation energy for desorption of Zn is reduced by approximately 6 kcal/mol. The Zn(a) <-> S(a) interaction is repulsive due to the electron-acceptor nature of both adsorbates,

引用

页码：L897 / L903

页数：7

共 29 条

[1] A SCALE OF ELECTRONEGATIVITY BASED ON ELECTROSTATIC FORCE [J].