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The absorption spectra and the photoconductivity spectra of quenched germanium crystal in the far-infrared region were measured at various temperatures. Seven hydrogenic line series named a, b, A, 1, 2, 3, and 4 were observed, and it is concluded from the temperature dependence of the intensity of both absorption and photoconductivity bands that the series named a and b, and 1 and 2, do not originate from two different acceptors but from one acceptor; in other words, the ground state of each acceptor, named SA 1 and SA 2 , respectively, is split into two levels producing two series for each acceptor. The ionization energy of the shallowest quenched-in acceptor, SA 1 , is the lowest among those of the well-known substitutional acceptors. It is pointed out that crystals containing the quenched-in acceptors are useful as far-infrared photoconductive detectors.
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Hattori et al. (1985) studied this question.
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