Stabilisation of alkali-adsorbate-induced states on Cu(111)surfaces

被引:79
作者
Borisov, AG
Kazansky, AK
Gauyacq, JP
机构
[1] Univ Paris Sud, Collis Atom & Mol Lab, UM CNRS, UMR 8625, F-91405 Orsay, France
[2] St Petersburg State Univ, Inst Phys, St Petersburg 198904, Russia
关键词
adsorbate level; adsorption; alkali; atom-solid interaction; copper;
D O I
10.1016/S0039-6028(99)00431-8
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
The Li and Cs alkali-adsorbate-induced states on a model Cu(111) surface are studied theoretically using the coupled angular mode and the wave packet propagation methods. Their energy position and their decay rate via one-electron transfer into the metal are calculated. An unoccupied alkali-induced state is found with a rather long lifetime, much longer than those found in the case of free-electron metal surfaces. This is attributed to the combined effect of the hybridisation of the alkali levels and of the Cu(111) projected band gap along the normal to the surface that blocks the electron transfer between the adsorbate and the metal. This qualitatively explains the experimental finding of a long-lived state by Bauer et al. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:165 / 175
页数:11
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