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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 Thomson (unit) ： ウィキペディア英語版 Thomson (unit) The thomson (symbol: Th) is a unit that has appeared infrequently in scientific literature relating to the field of mass spectrometry as a unit of mass-to-charge ratio. The unit was proposed by Cooks and Rockwood〔 〕 naming it in honour of J. J. Thomson who measured the mass-to-charge ratio of electrons and ions. ==Definition== The thomson is defined as :$1~\backslash mathrm\; =\; 1~\backslash frac\; =\; 1~\backslash frac\; =\; 1.036426\; \backslash times\; 10^\backslash ,\backslash mathrm\{kg\backslash ,C^\{-1\}\}$ where u represents the unified atomic mass unit, Da represents the unit dalton, and ''e'' represents the elementary charge which is the electric charge unit in the atomic unit system. For example, the ion C7H72+ has a mass of 91 Da. Its charge number is +2, and hence its charge is 2''e''. The ion will be observed at 45.5 Th in a mass spectrum. The thomson allows for negative values for negatively charged ions. For example, the benzoate anion would be observed not at ''m/z'' 121, but at −121 Th since the charge is −e. 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「Thomson (unit)」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.