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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 Wigner-Seitz radius ： ウィキペディア英語版 Wigner–Seitz radius The Wigner–Seitz radius $r\_s$, named after Eugene Wigner and Frederick Seitz, is the radius of a sphere whose volume is equal to the mean volume per atom in a solid. This parameter is used frequently in condensed matter physics to describe the density of a system. ==Formula== In a 3-D system with $N$ particles in a volume $V$, the Wigner–Seitz radius is defined by〔 :$\backslash frac\; \backslash pi\; r\_s^3\; =\; \backslash frac.$ Solving for $r\_s$ we obtain :$r\_s\; =\; \backslash left(\backslash frac\backslash right)^\backslash ,,$ where $n$ is the particle density of the valence electrons. For a non-interacting system, the average separation between two particles will be $2\; r\_s$. The radius can also be calculated as :$r\_s=\; \backslash left(\backslash frac\backslash right)^\backslash frac\backslash ,,$ where $M$ is molar mass, $\backslash rho$ is mass density, and $N\_A$ is the Avogadro number. This parameter is normally reported in atomic units, i.e., in units of the Bohr radius. Values of $r\_s$ for single valence metals〔 *〕 are listed below: 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「Wigner–Seitz radius」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.