| Project/Area Number |
10450059
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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 |
機械工作・生産工学
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| Research Institution | Osaka University |
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Principal Investigator |
YOSHII Kumayasu Graduate School of Engineering, Osaka University, Professor, 大学院・工学研究科, 教授 (30029152)
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| Co-Investigator(Kenkyū-buntansha) |
KAKIUCHI Hiroaki Graduate School of Engineering, Osaka University, Research Assistant, 大学院・工学研究科, 助手 (10233660)
YASUTAKE Kiyoshi Graduate School of Engineering, Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (80166503)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥7,900,000 (Direct Cost: ¥7,900,000)
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| Keywords | monochromatic atomic beam / velocity spectrometer / laser cooling / magnetic quadrupole lens / nanostructure / atom lithography / atom optics / atom interferometer / ナノストラクチャー / 単一速度原子ビーム |
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| Research Abstract |
Light induced force on atoms has been effectively used to manipulate neutral atomic motion in laser cooling or trapping, atom optics, atom interferometer, and atom lithography. In these experiments, an intense atomic beam with narrow longitudinal velocity distribution has been required. For the atom interferometer, the interference contrast is reduced by the velocity spread of the atomic beam. In the case of atom lithography, the ultimately narrow linewidth is obtained by using a monochromatic atomic beam. Therefore, preparation of a monochromatic atomic beam is quite important in various scientific and technological aspects. In this study, a velocity spectrometer for a neutral atomic beam has been developed to prepare a monochromatic atomic beam. In order to disperse a relatively fast atomic beam according to its longitudinal velocity, a magnetic quadrupole lens with a large magnetic gradient has been used. The device was made by NdFeB permanent magnets. The magnetic gradient in the quadrupole was measured to be sufficiently large (1T/cm) and uniform along radial direction. The resonance fluorescence spectra of the Li atomic beam after passing through the magnetic quadrupole lens have been measured by using a single mode tunable laser. From the peak shift of the fluorescence spectrum, the exerted force on Li atoms by the magnetic lens was 8160 times as large as the acceleration of gravity. Using the present spectrometer, we have measured the longitudinal velocity distribution of the thermal Li beam at 800℃, which was in good agreement with the result from the fluorescence spectra. It is expected that a monochromatic Li atomic beam of 1000m/s with the narrower velocity spread than 0.1% can be easily formed with a compact experimental arrangement using the developed velocity spectrometer.
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