VALENCE ELECTRONIC STRUCTURE OF OXYGEN-MODIFIEDα-Mo2C(0001)SURFACE: ANGLE-RESOLVED PHOTOEMISSION STUDY

M. Kato, K. Ozawa, T. Sato and K. Edamoto ()
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M. Kato: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-0033, Japan
K. Ozawa: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-0033, Japan
T. Sato: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-0033, Japan
K. Edamoto: Department of Chemistry, Rikkyo University, Nisi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan

Surface Review and Letters (SRL), 2006, vol. 13, issue 02n03, 185-190

Abstract: Adsorption of oxygen onα-Mo2C(0001)is investigated with Auger electron spectroscopy (AES), low-energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy (ARPES) utilizing synchrotron radiation. It is found thatCKLL Auger peak intensity does not change duringO2exposure, indicating that the depletion ofCatoms does not proceed. It is deduced from ARPES and LEED results that adsorbed oxygen atoms from a well-ordered(1 × 1)lattice on theα-Mo2C(0001)surface. The ARPES study shows that oxygen adsorption induces a peculiar state around Fermi level(EF). Off-normal-emission measurements prove that the state is a half-filled metallic state.

Keywords: Angle-resolved photoemission; Auger electron spectroscopy (AES); low-energy electron diffraction; carbides (LEED); oxygen (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008049

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