| Project/Area Number |
13440205
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機能・物性・材料
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| Research Institution | Tohoku University |
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Principal Investigator |
UDAGAWA Yasuo Tohoku University,lnstitute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (00004458)
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| Co-Investigator(Kenkyū-buntansha) |
KUROKI Yasuhisa Otsuka Pharmaceutical Co.Ltd, Researcher, 栄養研究所, 研究員
TAKAHASHI Masahiko Tohoku University,lnstitute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (80241579)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 2002: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2001: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | electron momentum spectroscopy / momentum space / wave functional form / glyoxal / biacetyl |
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| Research Abstract |
The present research project aims at determination of wavefunctional forms of molecules in the momentum space by the use of electron momentum spectroscopy(EMS). EMS makes use of inelastic electron scattering accompanied with ionization transition of molecules induced by electron collision. It is possible to determine wavefunctional form of individual orbitals, and through the Fourier transformation wavefunction of real (position) space can be obtained. Further aimed at is to understand the mechanism of molecular recognition in terms of the wavefunctional forms of orbitals such as H0M0.
The difficulties of this EMS lies in small scattering cross section, which results in low signal to noise ratio in spite of a long data-accumulation period, and hence it is very difficult to obtain quantitative data. In crder to overcome this difficulty we have constructed a new spectrometer by making use of two-dimensional detector. The major parts of this instrument were manufactured at the machine shop of the IMRAM, Tohoku University. The budget of the fiscal year 2001 was mainly appropriated for the materials to construct the spectrometer. As a result, we have succeeded in improving the detection efficiency significantly.
By using the newly built spectrometer, the following topics have been challenged in the fiscal year 2002.
1. Characterization of H0M0 and NHOMO of glyoxal and biacetyl through impact energy dependence of electron momentum distribution.
2. Higher excited states of CO.
3. Higher excited states of Hydrogen molecular ion
4. Momentum distribution of outer orbitals of N_2O.
At present, the chamber is being modified in order to be equipped with high-temperture nozzle, which makes it possible to extend the target to molecules with low molecules with low vapor pressure, such as glycine and adenine.
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