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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 Rotational temperature ： ウィキペディア英語版 Rotational temperature The characteristic rotational temperature (θR or θrot) is commonly used in statistical thermodynamics, to simplify the expression of the rotational partition function and the rotational contribution to molecular thermodynamic properties. It has units of temperature and is defined as〔P. Atkins and J. de Paula "Physical Chemistry", 9th edition (W.H. Freeman 2010), p.597〕 $\backslash theta\; \_R=\backslash frac\}$, where $\backslash bar\; B\; =\; B/hc$ is the rotational constant, and $I$ is a molecular moment of inertia. Also h is the Planck constant, c is the speed of light, ħ = h/2π is the reduced Planck constant and ''kB'' is the Boltzmann constant. The physical meaning of θR is as an estimate of the temperature at which thermal energy (of the order of kBT) is comparable to the spacing between rotational energy levels (of the order of hcB). At about this temperature the population of excited rotational levels becomes important. Some typical values are given in the table. In each case the value refers to the most common isotopic species. ==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「Rotational temperature」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.