Theory of the anomalous Rayleigh dispersion at H/W(110) surfaces

被引：42
作者：
Bungaro, C
de Gironcoli, S
Baroni, S
机构：
[1] IST NAZL FIS NUCL, I-34014 TRIESTE, ITALY
[2] SCUOLA INT SUPER STUDI AVANZATI, I-34014 TRIESTE, ITALY
[3] ECOLE NORMALE SUPER LYON, CECAM, F-69007 LYON, FRANCE
来源：
PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.77.2491
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The nature of the anomalies observed in the helium-atom scattering (HAS) and electron energy-loss (EELS) spectra of hydrogenated W(110) surfaces is investigated by calculating the full dispersion of the Rayleigh mode, using density-functional perturbation theory. We find excellent agreement between our calculations and the upper anomalous branch which is observed with both HAS and EELS. The lower branch-which is only detected by HAS-is instead not predicted. A hitherto unrecognized mechanism possibly responsible for the appearance of the second branch is proposed.
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页码：2491 / 2494
页数：4
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