Dynamic study of a surface-confined alloy in an ultrathin Ag/Pt(111) film

被引：19
|
作者：
Tsay, JS [1 ]
Yao, YD
Shern, CS
机构：
[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[2] Natl Taiwan Normal Univ, Dept Phys, Taipei 117, Taiwan
来源：
PHYSICAL REVIEW B | 1998年 / 58卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.58.3609
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
During alloy formation of the surface-confined fcc(lll) systems, we demonstrate that the energy barrier of diffusion for surface atoms can be determined from a dynamic study of a surface alloy by low-energy electron diffraction. The corresponding energy barrier of 0.95 +/- 0.11 eV was obtained from data consistent with the results of Monte Carlo simulations in submonolayer Ag/Pt(111) films. Ultrathin Ag him deposited at 360 K shows pseudomorphic growth. Annealing of a submonolayer ultrathin Ag film above 550 K causes formation of a two-dimensional surface alloy. After alloy formation, the vibration of surface atoms is enhanced and the enhancement could be as large as 70%.
引用
收藏
页码：3609 / 3612
页数：4
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