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Study of Surface Adsorption Mechanism by Core-level Deexcitation Spectroscopy

Research Project

Project/Area Number 07640769
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionTokyo Institute of Technology

Principal Investigator

EDAMOTO Kazuyuki  Tokyo Institute of Technology Dept.of Chemistry Associate Professor, 理学部, 助教授 (80185123)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsSurface Chemistry / Adsorption / Photoemission Spectroscopy / Core-level Deexcitation Spectroscopy / 自動イオン化
Research Abstract

Adsorption of molecules on solid surefaces can be viewed as a elemental process of various surface reactions such as catalytic reactions, thus it is very important to elucidate the details of the microscopic mechanism of adsorption process. When a molecule adsorbs on a surface, the adsorption bonding orbital should be formed through the hybridization between the orbitals of the molecule and the surface, and it is essentially important to investigate the hybridization mechanism to elucidate the mechanism of adsorption process. Usually, the adsorption bonding levels are studied with photoemission spectroscopy, however, the adsorption level is inevitably overlapped with the bulk band emissions in the photoemission spectra and it is difficult to resolve adsorptioh bonding levels. The purpose of this work is to develop the method to observe the adsorption bonding levels selectively by the use of core-level deexciation spectroscopy.
As the TiC (111) surface is exposed to oxygen, oxygen is adsorved dissociatively forming (1x1) overlayr. As the photoemission spectrum is measured under the conditiuon where Ti3p-3dexcitation occurs, it has been found that the O2p^Ti 3dadsorption level is resonantly enhanced to become main peak in the valence band spectra. Thus it is proved that adsorption bonding level can be selectively measured using core-level deexcitation spectroscopy. It is known that the alkali metal induced bonding level is difficult to observe due to the small cross section, . However it is proved that the bonding level can be selectively observed by the use obcore-level deexcitation spectroscopy.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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