翻訳と辞書 Words near each other ・ Exchanges in area code 413 ・ Exchanging contracts ・ Exchequer ・ Exchequer and Audit Departments Act 1866 ・ Exchequer Bill Loan Commission ・ Exchequer Court (Scotland) Act 1707 ・ Exchequer of Chester ・ Exchequer of Ireland ・ Exchequer of Normandy ・ Exchequer of Pleas ・ Exchequer of the Jews ・ Exchequer Secretary to the Treasury ・ Excideuil ・ Excidobates ・ Excidobates captivus ・ Excimer ・ Excimer lamp ・ Excimer laser ・ Excinuclease ・ Excipient ・ Excise ・ Excise Academy and Research Centre ・ Excise and taxation department, Punjab (Pakistan) ・ Excise stamp ・ Excise stamps of Russia ・ Excise stamps of Ukraine ・ Excise tax in the United States ・ Excise Tax Reduction Act of 1954 ・ Excise, Overhead, Handling ・ Excised and Anatomised 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 Excimer ： ウィキペディア英語版 Excimer An excimer〔Birks, JB "Excimers", ''Rep. Prog. Phys.'' 1975, ''38'', 903-974.〕 (originally short for excited dimer) is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which has completely filled valence shell by electrons (for example, noble gases). In this case, formation of molecules is possible only if such atom is in an electronic excited state. Heteronuclear molecules and molecules that have more than two species are also called exciplex molecules (originally short for excited complex). Excimers are often diatomic and are composed of two atoms or molecules that would not bond if both were in the ground state. The lifetime of an excimer is very short, on the order of nanoseconds. Binding of a larger number of excited atoms form Rydberg matter clusters, the lifetime of which can exceed many seconds. ==Formation and decay== Under the molecular orbital formalism, a typical ground-state molecule has electrons in the lowest possible energy levels. According to the Pauli principle, at most two electrons can occupy a given orbital, and if an orbital contains two electrons they must be in opposite spin states. The highest occupied molecular orbital is called the HOMO and the lowest unoccupied molecular orbital is called the LUMO; the energy gap between these two states is known as the HOMO/LUMO gap. If the molecule absorbs light whose energy is larger than this gap, an electron in the HOMO may be excited to the LUMO. This is called the molecule's excited state. Excimers are only formed when one of the dimer components is in the excited state. When the excimer returns to the ground state, its components dissociate and often repel each other. The wavelength of an excimer's emission is longer (smaller energy) than that of the excited monomer's emission. An excimer can thus be measured by fluorescent emissions. Because excimer formation is dependent on a bimolecular interaction, it is promoted by high monomer density. Low-density conditions produce excited monomers that decay to the ground state before they interact with an unexcited monomer to form an excimer. 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「Excimer」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.