Electronic structure of NO adsorbed on stepped Pd(112)

The electronic structure of nitric oxide adsorbed on a stepped Pd(112) surface has been investigated by ultraviolet photoelectron spectroscopy (UPS). The stepped Pd(112) surface is composed of three-atom-wide terraces of (111) orientation and monatomic steps of (001) symmetry. It was found that thre...

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Bibliographic Details
Published in:Surface science 1999-08, Vol.433, p.297-301
Main Authors: Irokawa, Katsumi, Ito, Sei, Kioka, Toshihide, Miki, Hirofumi
Format: Article
Language:English
Subjects:
Chemisorption
Nitric oxide
Palladium
Stepped single crystal surfaces
Surface electronic phenomena
Ultraviolet photoelectron spectroscopy
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Summary:The electronic structure of nitric oxide adsorbed on a stepped Pd(112) surface has been investigated by ultraviolet photoelectron spectroscopy (UPS). The stepped Pd(112) surface is composed of three-atom-wide terraces of (111) orientation and monatomic steps of (001) symmetry. It was found that three peaks appeared at 2.7, 9.4 and 14.8 eV below the Fermi level at low coverage. These peaks originate from 2π, 1π+5σ and 4σ orbitals of NO adsorbed on (111) terrace sites of Pd(112), respectively. With increasing coverage, a new additional peak appeared at 11.2 eV. This peak may originate from the 1π+5σ orbital of NO adsorbed on step sites of Pd(112). The difference in value between 1π and 4σ orbitals of NO adsorbed on step sites is smaller than that on terrace sites. This indicates that the NO bond of NO adsorbed on terrace sites is weaker than that on step sites. This result is consistent with high-resolution electron energy loss spectroscopy (HREELS) data.
ISSN:0039-6028
1879-2758
DOI:10.1016/S0039-6028(99)00162-4