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Above threshold ionization
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Above threshold ionization : ウィキペディア英語版
Above threshold ionization

Within atomic, molecular, and optical physics above threshold ionization (ATI), which was first observed in 1979,〔
* The original paper on the discovery
〕 is a multi-photon effect where an atom is ionized with more than the required number of photons.
In the case of ATI the peaks should appear at
: E_s = (n + s)\hbar \omega - W,
where the integer n represents the minimum number of photons absorbed and the integer s represents the number of additional photons absorbed. W is the ionization energy and E_s is the electron kinetic energy of the peak corresponding to s additional photons being absorbed.
==Structure==
It typically has a very strong maxima at the minimum number of photons to ionize the system, with successive peaks (known as ATI peaks) separated by the photon energy and thus corresponding to higher numbers of photons being absorbed.〔
In the non-perturbative regime the bound states are dressed with the electric field, shifting the ionization energy. If the ponderomotive energy of the field is greater than the photon energy \omega then the first peak disappears.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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