Exciton autoionization in ion-induced electron emission

被引：24
|
作者：
Bajales, N. [1 ]
Cristina, L. [1 ]
Mendoza, S. [1 ]
Baragiola, R. A. [1 ]
Goldberg, E. C. [1 ]
Ferron, J. [1 ]
机构：
[1] Univ Virginia, Charlottesville, VA 22904 USA
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 22期
关键词：
D O I：
10.1103/PhysRevLett.100.227604
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on measurements of electron emission spectra from surfaces of highly oriented pyrolytic graphite (HOPG) excited by 1-5 keV He+ and Li+ which, for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation explains the observed absence of high-energy excitons for Li+ on HOPG.
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页数：4
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