High Quality Content by WIKIPEDIA articles! In quantum physics, Fermi's golden rule is a way to calculate the transition rate (probability of transition per unit time) from one energy "eigenstate" (energy state) of a quantum system into a continuum of energy eigenstates, due to a perturbation. Fermi's golden rule is valid when the initial state has not been significantly depleted by scattering into the final states. The most common way to derive the equation is to start with time-dependent perturbation theory and to take the limit for absorption under the assumption that the time of the measurement is much larger than the time needed for the transition.

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