1993 Fiscal Year Final Research Report Summary
Scattering of very low energy positrons by atoms and molecules
| Project/Area Number |
04640388
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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 |
物理学一般
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| Research Institution | Yamaguchi University |
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Principal Investigator |
SUEOKA Osamu Applied Science, Faculty of Engineering, 工学部, 教授 (00012378)
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| Co-Investigator(Kenkyū-buntansha) |
HAMADA Akira 山口短期大学, 電子情報学科, 講師 (20241218)
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| Project Period (FY) |
1992 – 1993
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| Keywords | low-energy positron / positron scattering / electron-atom collision / moderater / work function |
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| Research Abstract |
An apparatus for total cross section measurements using very low-energy positron beams was built with a time-of-flight method. The apparatus was used under very low magnetic field for beam guide. The available lowest energy by this apparatus is 0.3 eV, it is the lowest record in the world of positron scattering experiments. The apparatus were used for the measurements of total cross sections of low energy posi-trons colliding with various molecules.
For very weak intensity of positron beams, total cross section measurements are only possible. Molecules (1. H_2, 2. O_2, 3. C_6H_6(Bezene), 4. N_2, CO, and CO_2---the number correspond to the group of the study) are used. For weak intensity we obtain only a few datum points with insufficient accuracy in spite of large endeavor. We can't obtained remarkable information in the low energy. However, we have offered the datum points at 0.3-0.6 eV.
Another method for providing super slow positron beams, was tried. Namely, the transmission type brightness enhancement under non-ultra high vacuum (1x10-6T). This try succeeded partly, but as a practical application difficult problems were pointed out.
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