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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 Helium trimer ： ウィキペディア英語版 Helium trimer The helium trimer is a weakly bound molecule consisting of three helium atoms. Van der Waals forces link the atoms together. The combination of three atoms is much more stable than the two atom helium dimer. The three atom combination of helium-4 atoms is an Efimov state. Helium-3 is predicted to form a trimer, although ground state dimers containing helium-3 are completely unstable. Helium trimer molecules have been produced by expanding cold helium gas from a nozzle into a vacuum chamber. Such a set up also produces the helium dimer and other helium atom clusters. The existence of the molecule was proven by matter wave diffraction on a diffraction grating. The kind of grating used needs to have empty space between the bars, so that molecules can pass through, glass would stop helium. Properties of the molecules can be discovered by Coulomb explosion imaging〔 in which a laser ionizes all three atoms simultaneously, and then three ions fly apart and are then detected. The helium trimer is large, being more than 100 Å, which is even larger than the helium dimer. The atoms are not arranged in a equilateral triangle as might be expected, but form random shaped triangles. ==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「Helium trimer」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.