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In this paper we present the results of an investigation of the 1s-2p_{+} intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity...
The far-infrared photoconductivity of a semi-insulating GaAs sample was measured at 4.2 K as a function of magnetic field up to 7 T. Apart from a peak corresponding to the 1s - 2p_{+1} transition of the hydrogen-like shallow donor, a well-pronounced structure was observed which does not appear in n-type GaAs.
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