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Surface-embedded oxygen: Electronic structure of Ag(111) and Cu(poly) oxidized at atmospheric pressure
SchedelNiedrig, T; Bao, X; Muhler, M; Schlogl, R
KeywordAdsorption Catalysis Spectroscopy Photoelectron Spectroscopy X-ray
Source PublicationBERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS
1997-07-01
Volume101Issue:7Pages:994-1006
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordRAY-ABSORPTION SPECTROSCOPY ; TRANSITION-METAL OXIDES ; PHOTOELECTRON-SPECTROSCOPY ; FINE-STRUCTURE ; ENERGY-LOSS ; SILVER ; ADSORPTION ; OXIDATION ; CU2O ; DIFFRACTION
AbstractWe investigated the surface electronic structure of an oxidized Ag(111) single crystal and a polycrystalline Cu foil prepared under conditions of pressure and temperature (1000 mbar and 900 K) far beyond those used in usual UHV studies. It has recently been shown that a strongly bound oxygen species (O-gamma) apart from oxygen atoms chemisorbed on the surface (O-alpha) or oxygen atoms dissolved in the bulk (O-beta) can be prepared on on silver surfaces. Using core-level photoemission we show these three atomic oxygen species, O-alpha, O-beta and O-gamma, exhibit characteristic spectral properties. X-ray absorption spectroscopy at the O K-edge indicates that the formation of the strongly bound O-gamma species is accompanied by a strong hybridization between O2p and Ag4d states and that also the Ag5sp states are important for the metal-to-oxygen covalent interaction. The reaction with methanol was used to selectively remove the surface-embedded atomic species and to study the effect of the strongly bound oxygen O-gamma species on the valence electronic structure of silver. This separation of the oxygen species did not work for the more reactive copper-oxygen system. The chemical bonding interaction of the novel O-gamma species with silver is discussed in terms of the ligand-field theory emphasizing the covalent character of the interaction. For copper, the spectroscopic analysis is complicated by the existence of a stable oxide Cu2O with similar bonding properties of the oxygen than postulated for the surface-embedded species in silver.
Language英语
WOS IDWOS:A1997XK58700002
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/142803
Collection中国科学院大连化学物理研究所
Affiliation1.DALIAN INST CHEM PHYS,STATE KEY LAB CATALYSIS,DALIAN 116023,PEOPLES R CHINA
2.RUHR UNIV BOCHUM,LEHRSTUHL TECH CHEM,D-44780 BOCHUM,GERMANY
Recommended Citation
GB/T 7714
SchedelNiedrig, T,Bao, X,Muhler, M,et al. Surface-embedded oxygen: Electronic structure of Ag(111) and Cu(poly) oxidized at atmospheric pressure[J]. BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS,1997,101(7):994-1006.
APA SchedelNiedrig, T,Bao, X,Muhler, M,&Schlogl, R.(1997).Surface-embedded oxygen: Electronic structure of Ag(111) and Cu(poly) oxidized at atmospheric pressure.BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS,101(7),994-1006.
MLA SchedelNiedrig, T,et al."Surface-embedded oxygen: Electronic structure of Ag(111) and Cu(poly) oxidized at atmospheric pressure".BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS 101.7(1997):994-1006.
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