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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 Inverse photoemission spectroscopy ： ウィキペディア英語版 Inverse photoemission spectroscopy Inverse photoemission spectroscopy (IPES) is a surface science technique used to study the unoccupied electronic structure of surfaces, thin films, and adsorbates. A well-collimated beam of electrons of a well defined energy (< 20 eV) is directed at the sample. These electrons couple to high-lying unoccupied electronic states and decay to low-lying unoccupied states, with a subset of these transitions being radiative. The photons emitted in the decay process are detected and an energy spectrum, photon counts vs. incident electron energy, is generated. Due to the low energy of the incident electrons, their penetration depth is only a few atomic layers, making inverse photoemission a particularly surface sensitive technique. As inverse photoemission probes the electronic states above the Fermi level of the system, it is a complementary technique to photoemission spectroscopy. ==Theory== The energy of photons ($h\backslash nu$, which includes Planck's constant) emitted when electrons incident on a substance using an electron beam with a constant energy ($E\_i$) relax to a lower energy unoccupied state ($E\_f$) is given by the conservation of energy as: :$E\_i=E\_f+h\backslash nu\backslash ,$ By measuring $E\_i$ and $h\backslash nu$, the unoccupied state ($E\_f$) of the surface can be found. 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「Inverse photoemission spectroscopy」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.