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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 X-ray absorption fine structure ： ウィキペディア英語版 X-ray absorption fine structure X-ray absorption fine structure (XAFS) is a specific structure observed in X-ray absorption spectroscopy (XAS). By analyzing the XAFS, information can be acquired on the local structure and on the unoccupied local electronic states. ==Atomic spectra== The atomic X-ray absorption spectrum (XAS) of a core-level in an absorbing atom is separated into states in the discrete part of the spectrum called "bounds final states" or "Rydberg states" below the ionization potential (IP) and "states in the continuum" part of the spectrum above the ionization potential due to excitations of the photoelectron in the vacuum. Above the IP the absorption cross section attenuates gradually with the X-ray energy. Following early experimental and theoretical works in the thirties,〔U. Fano (Sullo spettro di assorbimento dei gas nobili presso il limite dello spettro d'arco ) Il Nuovo Cimento (1924-1942) 12, (1935) 154-161〕 in the sixties using synchrotron radiation at the National Bureau of Standards it was established that the broad asymmetric absorption peaks are due Fano resonances above the atomic ionization potential where the final states are many body quasi-bound states (i.e., a doubly excited atom) degenerate with the continuum.〔U. Fano and J. Cooper, (Spectral distribution of atomic oscillator strengths. ) Reviews of Modern Physics 40, (1968) 441〕 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「X-ray absorption fine structure」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.