Free-exciton absorption measurements in the temperature range 2-20K and corresponding luminescence measurements between 5 and 12K on high-purity germanium are described. Accurate threshold energies have been determined to yield values for the exciton energy gap, the LA and LO momentum-conserving phonon energies and the groundstate splitting of the free exciton.
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Mayer et al. (1979) studied this question.
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