Atomic collisions in sub-Kelvin temperature for atomic laser application

原子激光应用中亚开尔文温度下的原子碰撞

• 批准号: 11694087
• 负责人: KIMURA Mineo
• 金额: $ 1.28万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11694087/
• 关键词: Bose-Einstein Condensation; Micro-Kelvin temperature; van der Waals and Casimir-Polder interactions; Atomic collisions; Many-body effects; Rydberg atoms; Electron attachment; Spin flit processes; 超低速イオン; 発光性電荷移行; Bose-Einstein Condensation; 弱長距

New observation of Bose-Einstein Condensation by using ultra-low temperature alkali atoms has opened up new era of low temperature physics as well as possible applications. We have investigated the origin and the nature of weak long-range interactions such as van der Waals and Casimir-Polder interactions for alkaline atomic pairs, and determined these interactions accurately. By incorporating these interactions into the formalism of scattering dynamics, we have carried out numerical calculations for obtaining scattering S matrix elements. In such low temperatures, only 1=0, s-wave, solely dominates for scattering. It has been known from the study of electron-molecule collisions that the s-wave resonance at E【greater than or equal】0 limit takes place although its physical rational is not well understood. However, we have provided rationales to these observations from our quantum mechanical scattering calculations for alkali atom collisions at ultra-low temperature with accurate long-range weak interactions. From the present study, we expect to contribute for further understanding of low-temperature physics as well as the basis for various applications including atomic laser.

通过使用超低温度碱原子对Bose-Einstein冷凝的新观察，已经开辟了低温物理学的新时代以及可能的应用。我们已经研究了弱远程相互作用的起源和性质，例如van der waals和酒精原子对的Casimir-Polder相互作用，并准确确定了这些相互作用。通过将这些相互作用纳入散射动力学的形式中，我们进行了数值计算，以获得散射S矩阵元素。在如此低的温度下，仅1 = 0，S波，仅主要用于散射。从对电子 - 分子碰撞的研究中可以知道，尽管尚不清楚其物理合理性，但在e【大于或等于】0限制的s波共振发生了。但是，我们从我们的量子机械散射计算计算中为碱原子碰撞的量子机械散射计算提供了理由，并具有准确的远程弱相互作用。从本研究中，我们希望有助于进一步了解低温物理，以及包括原子激光在内的各种应用的基础。

项目成果

M.Kitajima,Y.Sakamoto,S.Watanabe,T.Suzuki,T.Ishikawa,H.Tanaka & M.Kimura: "ABSOLUTE ELASTIC DIFFERENTIAL CROSS-SECTIONS FOR ELECTRON SCATTERING BY N_2O AT 1.5-100eV"Chem.Phys.Let.. 309. 414-420 (1999)

M.Kitajima、Y.Sakamoto、S.Watanabe、T.Suzuki、T.Ishikawa、H.Tanaka

H.Tanaka,M.Kitajima,O.Sueoka,A.Hamada & M.Kimura: "TOTAL AND DIFFERENTIAL CROSSS ECTIONS OF C_3H_8 AND C_3F_8 BY ELECTRON AND POSITRON IMPACTS"Phys.Rev.A.. 59. 2006-2015 (1999)

H.田中,M.北岛,O.末冈,A.滨田

M.KiMura & I.Shimamura: "ENERGY DISSIPATION FROM ADSORPED MOLECULES ON SURFACE"Chem.Phys.Lett. (2001)

木村先生

M.Kimura & O.Sueoka: "CAN POLYATOMIC MOLECULES HOLD POSITRON?"Butsuri. 55. 433-438 (2000)

木村先生

M.K.Kawada,O.Sueoka & M.Kimura: "TTOTAL CROSS-SECTIONS IN CF_3I BY POSITRON AND ELECTRON IMPACTS"Chem.Phys.Lett.. 330. 34-40 (2000)

M.K.川田,O.末冈