翻訳と辞書 Words near each other ・ Selection (linguistics) ・ Selection (relational algebra) ・ Selection (user interface) ・ Selection algorithm ・ Selection and amplification binding assay ・ Selection and Training in the British Army ・ Selection Best ・ Selection bias ・ Selection box ・ Selection coefficient ・ Selection Committee ・ Selection cutting ・ Selection in planning ・ Selection methods in plant breeding based on mode of reproduction ・ Selection ratio ・ Selection rule ・ Selection shadow ・ Selection Sixteen ・ Selection sort ・ Selection-based search ・ Selections from Burmese Folk Tales ・ Selections from George Gershwin's Folk Opera Porgy and Bess ・ Selections from Going My Way ・ Selections from Irving Berlin's White Christmas ・ Selections from Lerner and Loewe's... ・ Selections from Road to Rio ・ Selections from Road to Utopia ・ Selections from Showboat ・ Selections from Straight Outta Lynwood ・ Selections from the Arista Years Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Selection rule ： ウィキペディア英語版 Selection rule In physics and chemistry, a selection rule, or transition rule, formally constrains the possible transitions of a system from one quantum state to another. Selection rules have been derived for electromagnetic transitions in molecules, in atoms, in atomic nuclei, and so on. The selection rules may differ according to the technique used to observe the transition. In the following, mainly atomic and molecular transitions are considered. ==Overview== In quantum mechanics the basis for a spectroscopic selection rule is the value of the transition moment integral〔Harris & Bertolucci, p. 130〕 :$\backslash int\; \backslash psi\_1^$ * \mu \psi_2 d\tau , where $\backslash psi\_1$ and $\backslash psi\_2$ are the wave functions of the two states involved in the transition and µ is the transition moment operator. If the value of this integral is zero the transition is forbidden. In practice, the integral itself does not need to be calculated to determine a selection rule. It is sufficient to determine the symmetry of transition moment function, $\backslash psi\_1^$ * \mu \psi_2. If the symmetry of this function spans the totally symmetric representation of the point group to which the atom or molecule belongs then its value is (in general) not zero and the transition is allowed. Otherwise, the transition is forbidden. The transition moment integral is zero if the transition moment function, $\backslash psi\_1^$ * \mu \psi_2, is anti-symmetric or odd, i.e. ''y(x) = -y(-x)'' holds. The symmetry of the transition moment function is the direct product of the parities of its three components. The symmetry characteristics of each component can be obtained from standard character tables. Rules for obtaining the symmetries of a direct product can be found in texts on character tables.〔 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「Selection rule」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.