GEOMETRIC STRUCTURE AND SURFACE VIBRATIONS OF CU(001) DETERMINED BY MEDIUM-ENERGY ION-SCATTERING

被引：63

作者：

JIANG, QT ^{[1
]}

FENTER, P ^{[1
]}

GUSTAFSSON, T ^{[1
]}

机构：

[1] RUTGERS STATE UNIV,SURFACE MODIFICATION LAB,PISCATAWAY,NJ 08855

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.44.5773

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the geometric structure and the vibrational properties of Cu(001) with medium-energy ion scattering. The surface structure follows the common trend for metal surfaces. The surface relaxation is found to be small and oscillatory with a top-layer contraction (DELTA-d12) of -2.4% and a second-layer expansion (DELTA-d23) of +1%. In addition, we find that the surface vibrational amplitude is enhanced (as is usually the case) by approximately 80%. A detailed analysis of our data shows an unexpected anisotropy of the vibrational amplitude, such that the out-of-plane vibrational amplitude is 30% smaller than the in-plane vibrational amplitude. This anisotropy can be removed by adsorbing 1/4 monolayer of sulfur on the surface. Our results are discussed in the context of surface stress and surface contractions.

引用

页码：5773 / 5778

页数：6

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