COMBINED HELIUM-ATOM-SCATTERING AND MOLECULAR-DYNAMICS STUDY OF ALUMINUM SURFACE-PHONON ANHARMONICITIES AND LINEWIDTHS

被引：29
|
作者：
GESTER, M
KLEINHESSELINK, D
RUGGERONE, P
TOENNIES, JP
机构：
[1] UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND
[2] UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717
来源：
PHYSICAL REVIEW B | 1994年 / 49卷 / 08期
关键词：
D O I：
10.1103/PhysRevB.49.5777
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The temperature dependence of the Rayleigh surface-phonon energies and widths have been measured with high-resolution helium-atom scattering for the GAMMABAR-XBAR direction and the GAMMABAR-XBAR directions on Al(100) and Al(111), respectively. Over a wide range of wave vectors the measured shifts and widths are in good agreement with a molecular-dynamics simulation based on a simple nearest-neighbor Morse potential. Contrary to previous reports of an enhanced shift in frequency with temperature on Cu(110), these results indicate that this measure of anharmonicity on close-packed aluminum surfaces is about 30% greater than that of the bulk.
引用
收藏
页码：5777 / 5780
页数：4
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