High-resolution photoemission study of the (Y)over-bar surface state on Ag(110)

被引：31

作者：

Gerlach, A ^{[1
]}

Meister, G ^{[1
]}

Matzdorf, R ^{[1
]}

Goldmann, A ^{[1
]}

机构：

[1] Univ Kassel, Fachbereich Phys, D-34132 Kassel, Germany

来源：

SURFACE SCIENCE | 1999年 / 443卷 / 03期

关键词：

angle-resolved photoemission; electronic surface states; low-index single crystal surfaces; second-harmonic generation; silver; surface electronic phenomena;

D O I：

10.1016/S0039-6028(99)01004-3

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：

We report a high-resolution study of the 'Shockley-type' occupied surface state residing in the projected L-2'-L-1 gap around the (Y) over bar point of the surface Brillouin zone. Along <(Gamma Y)over bar> on Ag(110) this band shows a parabolic dispersion with kll, the surface wave vector. The effective mass is m*/m = 0.26 +/- 0.02 and the bottom of the parabola at (Y) over bar shows a linear dependence on sample temperature according to E-0 = -(106 +/- 5) meV + (0.17 +/- 0.01 meV/K)T. In consequence, the surface band gets empty above T = 624 +/- 37 K. These numbers give a quantitative interpretation of strong temperature effects observed earlier by other authors in second-harmonic spectra from Ag(110), where the fundamental light couples the occupied surface state to an unoccupied surface state within the same projected gap. From our data we derive a more precise value of its bottom energy E-f = 1.66 +/- 0.02 eV above E-F at (Y) over bar. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：221 / 226

页数：6

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