INTERFACE MODE FOR NACL OVERLAYERS ON THE GE(001) SURFACE

被引：12

作者：

BRUSDEYLINS, G

LUO, NS

RUGGERONE, P

SCHMICKER, D

TOENNIES, JP

VOLLMER, R

WACH, T

机构：

[1] Max-Planck-Institut für Strömungsforschung, 3400 Göttingen

来源：

SURFACE SCIENCE | 1992年 / 272卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(92)91463-L

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：

The structure and dynamical behaviour of NaCl overlayers on the Ge(001) surface have been investigated with helium atom scattering (HAS). For coverages of 2 and 3 layers of NaCl on the Ge(001) surface. a low energy mode at about 2 meV has been detected along the [100] and [110] directions. This mode is characterized by decreasing intensity for wavevectors approaching the zone boundary and it disappears with increasing NaCl coverage. Moreover, the experimental data show an avoided crossing between the Rayleigh wave of NaCl and this low energy mode. A slab calculation within the framework of a simple force constant model provides an interpretation of the experimental features and indicates that the low energy mode is an interface mode.

引用

页码：358 / 364

页数：7

共 5 条

[1] STUDIES OF VIBRATIONAL SURFACE MODES IN IONIC-CRYSTALS .1. DETAILED SHELL-MODEL STUDIES FOR UNRELAXED (001) FACE OF 7 CRYSTALS HAVING ROCKSALT STRUCTURE [J].