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Direct interband magneto-optical transitions have been observed in pure n-type InSb at liquid-helium temperature using magnetic fields up to 96. 5 kG. The theory of the magnetic levels in the valence and conduction bands at the zone center is carried out using a modification of the method of Luttinger and Kohn. The interaction between conduction and valence bands has been treated exactly, and the effect of higher bands to order k^2. Selection rules have been evaluated for both allowed (=0, -2) and warping-induced (=2, 4, -6) direct valence-to-conduction-band transitions. Comparison of theoretical with experimental spectra (using circular and plane-polarized light in the Faraday and Voigt configurations, respectively) has shown good agreement for the magnetic field in the 110 and 100 crystal directions. The following band parameters are obtained: conduction-band effective mass m₂=0. 0145m₀: light-hole effective mass m₋. ₇. =0. 0160m₀; heavy-hole effective masses m₇. ₇. 100=0. 32m₀, m₇. ₇. 110=0. 42m₀, m₇. ₇. 111=0. 44m₀.
Pidgeon et al. (Fri,) studied this question.