Retrieving the dielectric function of diamond from valence electron energy-loss spectroscopy

被引：16
|
作者：
Zhang, L. [1 ]
Erni, R. [2 ]
Verbeeck, J. [1 ]
Van Tendeloo, G. [1 ]
机构：
[1] Univ Antwerp, EMAT, B-2000 Antwerp, Belgium
[2] Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 19期
关键词：
D O I：
10.1103/PhysRevB.77.195119
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A data-acquisition and data-processing method is proposed that aims at minimizing the effect of retardation on the Kramers-Kronig analysis of valence electron energy-loss spectra. This method is applied to diamond, which, due to its high dielectric constant, is a material that shows strong retardation effects and thus is a challenging material to be studied by valence electron energy-loss spectroscopy. The results obtained show a significant improvement but still show small discrepancies with respect to optical data, which are most likely due to the residual retardation contributions and the fact that nonzero momentum transfers are measured.
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页数：7
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