Microwave radiation is observed from electrically biased semiconducting BiSb alloys. The radiation emitted from Bi₉₂{Sb}₈$ and its harmonics to the fourth order are very narrow band and coherent. The mechanism of emission is postulated to be a super-radiant maser effect due to transitions between paramagneticlike levels pumped by the electric current.
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Nanṅey et al. (1969) studied this question.
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