Investigating surface dynamics with inelastic x-ray scattering

被引：7

作者：

Murphy, B. M. ^{[1
]}

Mueller, M. ^{[1
]}

Stettner, J. ^{[1
]}

Requardt, H. ^{[2
]}

Serrano, J. ^{[2
]}

Krisch, M. ^{[2
]}

Press, W. ^{[1
]}

机构：

[1] Univ Kiel, Inst Expt & Angewandte Phys, D-24098 Kiel, Germany

[2] ESRF, F-38043 Grenoble 9, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 22期

关键词：

D O I：

10.1088/0953-8984/20/22/224001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A brief overview of application of the grazing incidence inelastic x-ray scattering experimental method will be presented. Inelastic x-ray scattering in grazing incidence conditions provides a new tool for selectively studying both surface and bulk lattice dynamics in a single experiment. It is possible to study acoustic and optical surface phonon modes currently with a 3 meV resolution over a wide range of momentum space and make a direct comparison between surface and bulk dispersion. In particular the case of 2H-NbSe2 will be discussed. For this material a Kohn anomaly has been previously reported. Our data demonstrate that the softening of the Kohn anomaly at the 2H-NbSe2 surface is significantly greater than that reported for the bulk. This is an indication of a relaxation in the topmost layers of the crystal.

引用

页数：6

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