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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Manipulation of atoms by optical field ： ウィキペディア英語版 Manipulation of atoms by optical field When a group of atoms is super-cooled to temperatures near absolute zero, they form a Bose–Einstein condensate, a state of matter where quantum effects can be observed in the macroscopic system. In this state, the trajectories of the atoms can be manipulated using light. If a super-cooled atomic gas is placed in a standing light wave produced by two counter-propagating lasers of certain frequency, the atoms are diffracted in different order. A cold atom absorbs a photon from one of the laser beams and emits a photon in the other beam receiving a net momentum of $2\backslash hbar\; k$ in the direction of the absorbed photon. Here $k$ is the magnitude of the wave vector of the laser. This is called two-photon recoil process. In such situation, a BEC cloud sitting at the center of a trap is split into two identical clouds. The clouds then travel in opposite directions with a velocity, $v\; =\; 2\backslash hbar\; k\; /\; m$ in the direction of the photon. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Manipulation of atoms by optical field」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.