翻訳と辞書 Words near each other ・ Gas constant ・ Gas contractor ・ Gas Control Equipment Ltd ・ Gas core reactor rocket ・ Gas cracker ・ Gas cylinder ・ Gas depletion ・ Gas detector ・ Gas diffusion electrode ・ Gas diffusion method ・ Gas Dream ・ Gas duster ・ Gas dwarf ・ Gas dynamic cold spray ・ Gas dynamic laser ・ Gas electron diffraction ・ Gas electron multiplier ・ Gas engine ・ Gas Engine & Power Company & Charles L. Seabury Company ・ Gas evolution reaction ・ Gas exchange ・ Gas explosion ・ Gas Exporting Countries Forum ・ Gas flare ・ Gas flow computer ・ Gas focusing ・ Gas Food Lodging ・ Gas Food Lodging (EP) ・ Gas Gang ・ Gas gangrene 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 Gas electron diffraction ： ウィキペディア英語版 Gas electron diffraction Gas electron diffraction (GED) is one of the applications of electron diffraction techniques. The target of this method is the determination of the structure of gaseous molecules i.e. the geometrical arrangement of the atoms from which a molecule is built up. Diffraction occurs because the wavelength of electrons accelerated by a potential of a few thousand volts is of the same order of magnitude as internuclear distances in molecules. The principle is the same as that of other electron diffraction methods such as LEED and RHEED, but the obtainable diffraction pattern is considerably weaker than those of LEED and RHEED because the density of the target is about one thousand times smaller. Since the orientation of the target molecules relative to the electron beams is random, the internuclear distance information obtained is one-dimensional. Thus only relatively simple molecules can be completely structurally characterized by electron diffraction in the gas phase. It is possible to combine information obtained from other sources, such as rotational spectra, NMR spectroscopy or high-quality quantum-mechanical calculations with electron diffraction data, if the latter are not sufficient to determine the molecule's structure completely. The total scattering intensity in GED is given as a function of the momentum transfer, which is defined as the difference between the wave vector of the incident electron beam and that of the scattered electron beam and has the reciprocal dimension of length. The total scattering intensity is composed of two parts: the atomic scattering intensity and the molecular scattering intensity. The former decreases monotonically and contains no information about the molecular structure. The latter has sinusoidal modulations as a result of the interference of the scattering spherical waves generated by the scattering from the atoms included in the target molecule. The interferences reflect the distributions of the atoms composing the molecules, so the molecular structure is determined from this part. 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「Gas electron diffraction」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.