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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 Tunnel ionization ： ウィキペディア英語版 Tunnel ionization Tunnel ionization is a process in which electrons in an atom (or a molecule) pass through the potential barrier and escape from the atom (or molecule). In an intense electric field, the potential barrier of an atom (molecule) is distorted drastically. Therefore, the length of the barrier that electrons have to pass decreases and electrons can escape from the atom (molecule) easily. Tunneling Ionization is a QM phenomenon; as a non-zero probability event for observing a particle escaping from the deformed Coulomb potential barrier, obviously this phenomenon is forbidden by classical laws, as in the classical picture an electron does not have sufficient energy to escape. When the atom is in an external DC field, the Coulomb potential barrier is lowered and the electron can tunnel through the barrier. In the case of an alternating electric field, the direction of the electric field reverses after the half period of the field. The ionized electron may come back to its parent ion. The electron may recombine with the nucleus (nuclei) and its kinetic energy is released as light (high harmonic generation). If the recombination does not occur, further ionization may proceed by collision between high-energy electrons and a parent atom (molecule). This process is known as non-sequential ionization.〔Corkum, Paul B. "Plasma perspective on strong field multiphoton ionization."Physical Review Letters 71.13 (1993): 1994.〕 == DC tunneling ionization == Tunneling ionization from the ground state of a Hydrogen atom in an electrostatic (DC) field was solved schematically by Landau.〔L.D. Landau and E.M. Lifshitz, Quantum Mechanics (Pergamon, New York, 1965), 2nd ed., pg 276.〕 This provides a simplified physical system that given it proper exponential dependence of the ionization rate on the applied external field. When , the ionization rate for this system is given by: :$w\; =\; 4\; \backslash omega\_a\; \backslash frac\; \backslash exp\backslash left(-\backslash frac\backslash frac\; \backslash right)$ Landau expressed this in units where $m=e=\backslash hbar=1$. In SI units the previous parameters can be expressed as: :$E\_a\; =\; \backslash frac$, :$\backslash omega\_a\; =\; \backslash frac$. The ionization rate is the total probability current through the outer classical turning point. This is found using the WKB approximation to match the ground state hydrogen wavefunction though the suppressed coulomb potential barrier. 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「Tunnel ionization」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.