1992 Fiscal Year Final Research Report Summary
Development of Angle-Resolved Electron-Stimulated Desorption Spectrometer and its Application to be Detection of Excited Species on Surfaces
| Project/Area Number |
03554015
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理化学一般
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| Research Institution | The University of Tokyo |
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Principal Investigator |
IWASAWA Yasuhiro The University of Tokyo, Faculty of Science, Professor, 理学部, 教授 (40018015)
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| Co-Investigator(Kenkyū-buntansha) |
ONISHI Hiroshi The University of Tokyo, Faculty of Science, Research Associate, 理学部, 助手 (20213803)
ARUGA Tetsuya The University of Tokyo, Faculty of Science, Lecturer, 理学部, 講師 (70184299)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Electron stimulated desorption / Solid surface / Adsorption / Ru / CO |
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| Research Abstract |
We have constructed a novel ion spectrometer, named time-of-flight Fourier-transform ion spectrometer (TOFFTIS), which has significantly high detection efficiency and high enegy resolution at very low energies. The TOFFTIS has been mounted on an ultrahigh-vacuum compatible two-axis rotation assembly and installed in an ultrahigh-vacuum chamber. As a prelimainary experiment, electron-stimulated desorption of O^+ and CO^+ has been successfully obtained, demonstrating that TOFFTIS has a performance as expected.
By using TOFFTIS as a high-efficiency ion detector, we have developed a new experimental technique named angle-resolved electron-stimulated desorption spectroscopy (ARESDS) to investigate the dynamic behavior of excited species adsorbed on solid surfaces. Today, the basic understanding of the mechanism of chemical reactions on solid surfaces is truly demanded, since the advanced material technology, such as molecular-beam epitaxy, organometallic chemical vapor deposition, and X-ray/changed-particle lithogaphy, are based essentially on the surface chemical processes. The new technique utilizes the desorption of ions induced by electronic excitation by impinging electrons. The ions desorbed upon electronic excitations are known to carry rich information about the adsorption state of the parent molecules adsorbed on the surface. Detailed analysis of desorbed ions will provide quantitative description of the potential energy surface, both of ground and excited states. We have also studied on the coadsorption of carbon monoxide with methylamine and acetylene, the chemical modification of Mo(112) by chemisorbed oxygen atoms.
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