1991 Fiscal Year Final Research Report Summary
Characterization of Surface Defect Structures
| Project/Area Number |
02650537
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業分析化学
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| Research Institution | Institute of Industrial Science, University of Tokyo |
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Principal Investigator |
OWARI Masanori Institute of Industrial Science, Univesity of Tokyo, Lecturer, 生産技術研究所, 講師 (70160950)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Calcium fluoride / Electron bombardment / Surface defect / X-ray photoelectron spectroscopy / X-ray photoelectron diffraction / Chemical-state-discriminated XPED / Surface structural analysis / Epitaxial growth |
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| Research Abstract |
Calcium fluoride(fluorite), which is thermally stable and electrically insulating., is well known to desorb florine atoms as a result of electron bombardment in ultrahigh vacuum environment. The purpose of this research is to clarify the structure of surface defects created by electron bombardment on a calcium fluoride crystal.
After electron bombardment on a calcium fluoride crystal under vacuum of 10^<-8> Torr with 90% of H_2O, the surface defects immediately reacted with residual H_20 to yield calcium oxide phase. Chemicalstate-discriminated X-rgy photoelectron diffraction measurements showed that the calcium oxide phase was in epitaxial relationship with the substrate, in which the 111 axis was common between the substrate and. the overlayer, and the orientation-was 180ﾟ rotated with each other.
After electron bombardment under 10^<-9> Torr, surface defects were relatively stable. X-ray photoelectron spectroscopic measurements showed that fluorine atoms in two or three atomic layers from the 2 surface decreased in number by electron bombardment of about 1 mC/cm^2. Intensity of a specific peak at definite angle in an X-ray photoelectron diffraction pattern for Fls decreased after electron bombardment. In order to relate the change in an X-ray photoelectron diffraction pattern with surface defect structure, theoretical calculation based on single scattering scheme was performed. Experimental results were best interpreted by the model in which a part of fluorine atoms in the third atomic layer selectively desorbed.
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[Publications] C.Akita,T.Tomioka,M.Owari,A.Mizuike and Y.Nihei: "Structural Analysis of a Thin CaO Layer Formed by Electron Bombardment Heating on CaF_2(111)by Means of Chemical-State Disriminated XPED" The Structure of Surfaces III,edited by S.Y.Tong,M.A.Van Hove,K.Takayanagi and X.D.Xie,Springer Series in Surface Sciences,vol.24,Springer-Verlag Berlin,Heidelbera. 676-680 (1991)
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