Fermi's golden rules

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Fermi's golden rules [¦fer·mēz ¦gōld·ən ′rülz]

(quantum mechanics)

The equations giving the first-order (rule number 2) and second-order (rule number 1) contributions to the transition probability per unit time induced by a perturbation Hamiltonian, in terms of matrix elements of the perturbation Hamiltonian.

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