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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 Rabi frequency ： ウィキペディア英語版 Rabi frequency The Rabi frequency is the frequency of oscillation for a given atomic transition in a given light field. It also gives the measure of the fluctuation of population between the levels. It is associated with the strength of the coupling between the light and the transition. Rabi flopping between the levels of a 2-level system illuminated with resonant light, will occur at the Rabi frequency. The Rabi frequency is a semiclassical concept as it is based on a quantum atomic transition and a classical light field. In the context of a nuclear magnetic resonance experiment, the Rabi frequency is the nutation frequency of a sample's net nuclear magnetization vector about a radiofrequency field. (Note that this is distinct from the Larmor frequency, which characterizes the precession of a transverse nuclear magnetization about a static magnetic field.) == Definition == The Rabi frequency is defined as :$\backslash chi\_\; =\; \backslash cdot\backslash vec\_0\; \backslash over\; \backslash hbar\}$ where $\backslash scriptstyle\}$ is the transition dipole moment for the $\backslash scriptstyle$ transition and $\backslash scriptstyleE\_0\}$ is the vector electric field amplitude which includes the polarization. The numerator has dimensions of energy, so dividing by $\backslash scriptstyle$ gives an angular frequency. Although $\backslash scriptstyle\; =\; \backslash vec\_^$ *}, one cannot assume that $\backslash scriptstyle^$ *} as $\backslash scriptstyle$ may be complex, as in the case of circularly polarized light. By analogy with a classical dipole, it is clear that an atom with a large dipole moment will be more susceptible to perturbation by electric and magnetic fields. The dot product includes a factor of $\backslash cos\backslash theta$, where $\backslash theta$ is the angle between the polarization of the light and the transition dipole moment. When they are parallel or antiparallel the interaction is strongest, when they are perpendicular there is no interaction at all. In real systems, with more than two levels, the correct dipole transition matrix element for the relevant transition has to be calculated. When equating the Rabi frequency the correct Clebsch-Gordan coefficient has to be considered which is a common source of mistakes throughout scientific literature. There are also some publications that use a different definition for the Rabi frequency which is by a factor of two smaller than the one introduced here. Animation of optical resonance, frequency domain 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「Rabi frequency」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.