Normal-emission photoelectron studies of the W(110)(1 x 1)O surface

被引:10
作者
Feydt, J [1 ]
Elbe, A [1 ]
Engelhard, H [1 ]
Meister, G [1 ]
Goldmann, A [1 ]
机构
[1] Univ Gesamthsch Kassel, Fachbereich Phys, D-34132 Kassel, Germany
关键词
angle resolved photoemission; chemisorption; interface states; low index single crystal surfaces; oxygen; surface electronic phenomena; tungsten;
D O I
10.1016/S0039-6028(99)00796-7
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 have investigated normal-emission photoelectron spectra at various photon energies between (h) over bar omega = 11.8 eV and 29.8 eV from W(110) covered with about one monolayer of dissociatively chemisorbed oxygen. As expected, O(2p)-derived bonding orbitals appear energetically below the substrate Sd-valence-band emission and these are observed at initial state energies E-i = (-5.1 +/- 0.1) eV, (-6.1 +/- 0.1) eV and (-7.7 +/- 0.2) eV below the Fermi energy. In addition, however, drastic spectral changes are also induced in the W(5d) region and our interest is focused primarily on an understanding of the latter emission. All results clearly demonstrate its 2-dimensional character, with no detectable geometric reconstruction in the layers below. We give an interpretation in terms of emission from W(5d)-O(2p) strongly hybridized orbitals. These reside essentially in the outermost layer and are split off the bulk bands energetically by the action of the strongly oxygen-modified surface potential. By checking for intensity variations with Bw the overlayer orbitals can be identified in terms of their parent bulk bands. O 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:213 / 220
页数:8
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