Dispersion of the interband π electronic excitation of highly oriented pyrolytic graphite measured by high resolution electron energy loss spectroscopy

被引：19

作者：

Papageorgiou, N ^{[1
]}

Portail, M ^{[1
]}

Layet, JM ^{[1
]}

机构：

[1] Univ Aix Marseille 1, CNRS, UMR 6633, PIIM, F-13397 Marseille 20, France

来源：

SURFACE SCIENCE | 2000年 / 454卷 / 01期

关键词：

carbon; electron energy loss spectroscopy (EELS) electron-solid interactions; graphite; plasmons; polycrystalline surfaces; surface electronic phenomena (work function; surface potential; surface states; etc.); surface waves;

D O I：

10.1016/S0039-6028(00)00127-8

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：

We measured the momentum dependency of the energy and width of the pi plasmon in graphite, using high-resolution electron energy-loss spectroscopy. For low momentum transfer the energy dispersion is positive and for high momentum transfer it becomes constant, in contrast with previous transmission electron energy-loss measurements. The width dispersion is negative for low momentum transfer and positive for higher momentum transfer. In addition, we report an additional loss structure that disperses in the range 1-4 eV. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：462 / 466

页数：5

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