Free and bound exciton states of [111]-stressed germanium in a magnetic field have been investigated by means of far-infrared absorptions. The measurements are performed at quasi-continuous photon-energies by the use of discharge-type and optically pumped lasers. In the high stress region, the analysis of the observed free exciton Zeeman lines is carried out by the variational calculations in a simple band model. On the other hand, the bound exciton Zeeman lines are discussed qualitatively by donor- and acceptor-models of the excited states and in comparison with the free exciton spectra.
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Yamanaka et al. (1978) studied this question.
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