| Project/Area Number |
15540381
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
原子・分子・量子エレクトロニクス・プラズマ
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| Research Institution | The University of Electro- Communications |
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Principal Investigator |
WATANABE Shinichi The University of Electro-Communications, Faculty of Electro- Communications, Professor, 電気通信学部, 教授 (60210902)
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| Co-Investigator(Kenkyū-buntansha) |
OHTSUKI Kazumasa The University of Electro-Communications, Faculty of Electro- Communications, Assistant Professor, 電気通信学部, 助手 (80221828)
MORISHITA Toru The University of Electro-Communications, Faculty of Electro- Communications, Assistant Professor (20313405)
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| Project Period (FY) |
2003 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | BEC / Atto second laser and atoms dilute gas / Low temperature ion mobility in a dilute gas / BEC輸送問題 / 分子イオンの回転励起状態 / 量子論的運動量移行断面積 / BEC干渉効果 / アト秒光原子課程 / 低温分子イオン / 移動度 / 超球座標法 / イオン移動度 / 時間発展シミュレーション / 断熱近似 |
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| Research Abstract |
We studied adiabaticity and nonlinear dynamics in the context of the manipulation and control of the Bose-Einstein condensate (BEC) made of an atomic gas. We conducted a pilot study of the mechanism for the unanticipated creation of quantum vorticies in an experiment pertaining to the construction of a beam-splitter in a BEC-interferometer. Since the numerical techniques and the computer codes required for the analysis of BEC have much in common with those for the ultra-short laser pulses and their application to atomic physics, we observed a new development by applying the techniques to the ionization of atoms in ultra-intense laser fields and to the high-harmonics generation.
With a view to the representation of two-body interactions, we employed a computation scheme based on theoretical chemistry, and evaluated the mobility of an ion in a low-temperature gas of helium, thereby carrying out a dynamical analysis of the mobility and comparing it with experimental results. Quite unexpectedly, we pinned down the cause of the hitherto unsolved polarization-limit problem.
In addition to such discoveries, there emerged new challenges. For instance, the transformation of an atomic pair into a molecule at ultra-low temperatures constitutes a nonlinear STIRAP problem, which is an important issue under the present theme and is all the more applicable to related problems because of the universal mathematical nature of the nonlinear STIRAP problem. We expect more challenges will appear in relation to the adiabaticity and nonlinear dynamics in many-body physics at low temperatures. A new experimental development is equally likely in the field of ultra-short laser pulses and their interactions with atoms. We look forward to contributing to further progress.
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