An interferometric spectrometer manufactured by the Research and Industrial Instruments Company has been adapted for use in polarized far ir magnetooptical investigations. The system includes a superconducting magnet and light pipe optics. The use of an indium antimonide free electron bolometer and an extrinsic germanium photoconductive detector with the system is described. As an example of the operation of the spectrometer, some investigations of donor impurity states in indium antimonide have been outlined.
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R. Kaplan (1967) studied this question.