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Submillimeter Absorption Spectra amd Phase Transition of Indirect Excitons in Germanium

The results are presented of the detailed studies on the exciton absorption spectra in ultrapure Ge in the spectrum region 0.67–1.1 and 1.7–3.7 mev with a backward-wave tube radiation. It is shown that the measured spectrum corresponds to the exciton's transitions from the ground to excited states. As a result of themperature measurements at 1.6–4.2°K the phase transition of excitons into condensed state has been observed without the formation of excitonic molecules.