Oxygen adsorption on a Mo2C(0001) surface:: Angle-resolved photoemission study

被引：2
作者：
Kato, M.
Sato, T.
Ozawa, K.
Edamoto, K.
Nakadai, Y.
Otani, S.
机构：
[1] Rikkyo Univ, Dept Chem, Toshima Ku, Tokyo 1718501, Japan
[2] Tokyo Inst Technol, Dept Chem & Mat Sci, Meguro Ku, Tokyo 1520033, Japan
[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan
来源：
SURFACE SCIENCE | 2007年 / 601卷 / 01期
关键词：
angle-resolved photoemission; chemisorption; carbides; low index single-crystal surfaces; oxygen;
D O I：
10.1016/j.susc.2006.09.025
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：
Oxygen adsorption on a C-terminated alpha-Mo2C(0001) surface has been investigated with Auger electron spectroscopy, low-energy electron diffraction, and angle-resolved photoemission spectroscopy utilizing synchrotron radiation. It is found that the oxygen atoms adsorb on the Mo atoms in the second layer forming a (1 x 1) orthorhombic periodicity. The oxygen adsorption induces a peculiar state around the Fermi level, which is observed at 0.4 eV in the normal-emission spectra. ARPES measurements show that the state is a partially occupied metallic state. The photoionization cross section of the state shows a maximum at the photon energy of 56 eV, which is assigned as originating from the resonance of the Mo 4d photoemission involving Mo 4p -> 4d photoexcitation. (c) 2006 Elsevier B.V. All rights reserved.
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页码：201 / 208
页数：8
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