VALENCE ELECTRONIC STRUCTURE OF OXYGEN-MODIFIED Î±-Mo2C(0001) SURFACE: ANGLE-RESOLVED PHOTOEMISSION STUDY
Adsorption of oxygen on Î±-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 that C KLL Auger peak intensity does not change during O2 exposure, indicating that the depletion of C atoms does not proceed. It is deduced from ARPES and LEED results that adsorbed oxygen atoms from a well-ordered (1 Ã 1) lattice on the Î±-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.
Angle-resolved photoemission, Auger electron spectroscopy (AES), low-energy electron diffraction, carbides (LEED), oxygen
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