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The spectral distribution of the rate of photon generation for the photon-radiative recombination of electrons and holes in germanium is determined from known optical properties by application of the principle of detailed balance. Quantities characterizing the process are evaluated: The thermal equilibrium recombination rate at 300^ is 1. 5710^13 cm^-3 sec^-1, which corresponds to a recombination cross section of 2. 910^-21 cm^2 and a decay time for a small disturbance in carrier concentration in intrinsic material of 0. 75 sec. The extension to the steady-state case of added current carriers is given, and estimates are included of the dependence of the quantities on temperature.
Roosbroeck et al. (Tue,) studied this question.