The lowest ortho‐ and paraexcitons of Cu 2 O are studied by high‐resolution spectroscopy. After a detailed description of the experimental setup, the quadrupole polariton is extended to a two‐oscillator resonance. As an example, the group velocity of the M = ±1 orthoexciton components in a magnetic field of 0.1 T is measured and fitted to a two‐oscillator model with f (oscillator strength) as the only fit parameter. The paraexciton resonance is measured in a magnetic field of 10 T. Its oscillator strength is by almost a factor 200 lower than the oscillator strength of the orthoexciton. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Fröhlich et al. (2006) studied this question.
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