Time-resolved two-photon photoelectron spectroscopy of the Si(001)-(2 x 1) surface

被引:22
作者
Tanaka, S [1 ]
Tanimura, K [1 ]
机构
[1] Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan
关键词
photoelectron spectroscopy; laser methods; surface electronic phenomena (work function; surface potential; surface states; etc.); silicon; low index single crystal surfaces;
D O I
10.1016/S0039-6028(03)00358-3
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
The electron dynamics of the Si(001)-(2 x 1) surface has been studied by means of two-photon photoelectron spectroscopy. The photoelectron peak from the unoccupied surface state (D-down) of down-Si atoms of the dimers is clearly resolved spectroscopically and temporally. Time-resolved study shows that the D-down state is populated within 10 ps of excitation, and de-populated primarily with a time constant of 210 ps at 300 K. The rate of populating D-down states is excitation-intensity dependent, and has been ascribed to electron-electron scattering processes. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:L251 / L255
页数:5
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