SCANNING-TUNNELING-MICROSCOPY STUDY OF THE FACETING DYNAMICS OF STEPPED AG(110) UPON OXYGEN EXPOSURE

被引：12

作者：

OZCOMERT, JS ^{[1
]}

PAI, WW ^{[1
]}

BARTELT, NC ^{[1
]}

REUTTROBEY, JE ^{[1
]}

机构：

[1] UNIV MARYLAND,DEPT CHEM,COLLEGE PK,MD 20742

来源：

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1994年 / 12卷 / 04期

关键词：

D O I：

10.1116/1.579119

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dynamics of the room temperature faceting of Ag(110) upon exposure to oxygen has been studied using scanning tunneling microscopy (STM). Vicinal surfaces are exposed to oxygen while STM images are continuously collected. The surfaces are observed to break up into regions of high step density (''step bunches'') and (110) facets. This faceting is driven thermodynamically by the formation of an n X 1 oxygen overlayer on the (110) facet, in which rows of oxygen atoms form along the next-nearest neighbor [001] direction. The dynamics of this breakup are found to depend sensitively on the step-edge orientation of the original clean vicinal surface. The reversbility, and thus probable thermodynamic origin, of the faceting is demonstrated by removal of the oxygen through chemical reaction with CO.

引用

页码：2224 / 2228

页数：5

共 17 条

[1] THE MEANDERING OF STEPS AND THE TERRACE WIDTH DISTRIBUTION ON CLEAN SI(111) - AN INSITU EXPERIMENT USING REFLECTION ELECTRON-MICROSCOPY [J].