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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 Porod's law ： ウィキペディア英語版 Porod's law In X-ray or neutron small-angle scattering (SAS), Porod's law, discovered by Günther Porod, describes the asymptote of the scattering intensity ''I(q)'' for large scattering wavenumbers ''q''. == Context == Porod's law is concerned with wave numbers ''q'' that are small compared to the scale of usual Bragg diffraction; typically $q\backslash lesssim1\backslash text^$. In this range, the sample must not be described at an atomistic level; one rather uses a continuum description in terms of an electron density or a neutron scattering length density. In a system composed of distinct mesoscopic particles, all small-angle scattering can be understood as arising from surfaces or interfaces. Normally, SAS is measured in order to detect correlations between different interfaces, and in particular, between remote surface segments of one and the same particle. This allows conclusions about the size and shape of the particles, and their correlations. Porod's ''q'', however, is relatively large on the usual scale of SAS. In this regime, correlations between remote surface segments and inter-particle correlations are so random that they average out. Therefore one sees only the local interface roughness. 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「Porod's law」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.