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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 Fermi contact interaction ： ウィキペディア英語版 Fermi contact interaction The Fermi contact interaction is the magnetic interaction between an electron and an atomic nucleus when the electron is inside that nucleus. The parameter is usually described with the symbol ''A'' and the units are usually megahertz. The magnitude of ''A'' is given by this relationships :$A\; =\; -\backslash frac\; \backslash pi\; \backslash left\; \backslash langle\; \backslash boldsymbol\_n\; \backslash cdot\; \backslash boldsymbol\_e\; \backslash right\; \backslash rangle\; |\backslash Psi\; (0)|^2\backslash qquad\; \backslash mbox$ and :$A\; =\; -\backslash frac\; \backslash mu\_0\; \backslash left\; \backslash langle\; \backslash boldsymbol\_n\; \backslash cdot\; \backslash boldsymbol\_e\; \backslash right\; \backslash rangle\; |\backslash Psi(0)|^2,\; \backslash qquad\; \backslash mbox$ where ''A'' is the energy of the interaction, ''μ''''n'' is the nuclear magnetic moment, ''μ''''e'' is the electron magnetic dipole moment, and Ψ(0) is the value of the electron wavefunction at the nucleus.〔 〕 It has been pointed out that it is an ill-defined problem because the standard formulation assumes that the nucleus has a magnetic dipolar moment, which is not always the case.〔 〕 ==Use in magnetic resonance spectroscopy== Within an atom, only s-orbitals have non-zero electron density at the nucleus, so the contact interaction only occurs for s-electrons. Its major manifestation is in electron paramagnetic resonance and nuclear magnetic resonance spectroscopies, where it is responsible for the appearance of isotropic hyperfine coupling. Roughly, the magnitude of ''A'' indicates the extent to which the unpaired spin resides on the nucleus. Thus, knowledge of the ''A'' values allows one to map the singly occupied molecular orbital.〔 〕 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「Fermi contact interaction」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.