Previous work (ibid., vol.8, p.3137 and 3147 (1975)) is extended to include optical transitions between bands 2 and 3 of the valence band of p-type germanium. It is shown that the photon drag effect reverses in sign not less than five times in the wavelength range 2.5-11 mu m.
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Gibson et al. (1977) studied this question.
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