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Fermi's golden rule
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Fermi's golden rule : ウィキペディア英語版
Fermi's golden rule
In quantum physics, Fermi's golden rule is a simple formula for the ''constant'' transition rate (probability of transition per unit time) from one energy eigenstate of a quantum system into other energy eigenstates in a continuum, effected by a perturbation. This rate is effectively constant.
==General==
Although named after Enrico Fermi, most of the work leading to the Golden Rule is due to Paul Dirac who formulated 20 years earlier a virtually identical equation, including the three components of a constant, the matrix element of the perturbation and an energy difference.〔(【引用サイトリンク】author=Taco D. Visser )〕〔 See equations (24) and (32).〕 It was given this name because, on account of its importance, Fermi dubbed it "Golden Rule No. 2." 〔, formula VIII.2〕

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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