InSb samples at 4 K and Bₑₓₜ=0 are observed to emit narrow-band radiation in two bands near 400 and 600 MHz. The frequency ratio of the two bands strongly suggests that the emission is due to nuclear electric-quadrupole transitions 3/2→1/2 of Sb¹²¹ and Sb¹²³ nuclei located near impurity atoms. The nuclear electric quadrupole hypothesis explains simply many of the previously puzzling aspects of Insb microwave emission.
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C. A. Nanṅey (1972) studied this question.
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