Far-Infrared Optical Properties of Quenched Germanium I. The Temperature Dependence of the Absorption and the Photothermal Ionization Spectra

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Abstract
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 SA1 and SA2, respectively, is split into two levels producing two series for each acceptor. The ionization energy of the shallowest quenched-in acceptor, SA1, 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.