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题名: Surface-embedded oxygen: Electronic structure of Ag(111) and Cu(poly) oxidized at atmospheric pressure
作者: SchedelNiedrig, T;  Bao, X;  Muhler, M;  Schlogl, R
关键词: adsorption ;  catalysis ;  spectroscopy, photoelectron ;  spectroscopy, X-ray
刊名: BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 1997-07-01
卷: 101, 期:7, 页:994-1006
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: We 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.
关键词[WOS]: RAY-ABSORPTION SPECTROSCOPY ;  TRANSITION-METAL OXIDES ;  PHOTOELECTRON-SPECTROSCOPY ;  FINE-STRUCTURE ;  ENERGY-LOSS ;  SILVER ;  ADSORPTION ;  OXIDATION ;  CU2O ;  DIFFRACTION
语种: 英语
WOS记录号: WOS:A1997XK58700002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142803
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.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:
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.
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