Abstract
The yellow-exciton series in natural single crystals of Cu 2O are studied by one- and two-photon spectroscopy in high precision at 2K. The energies of the p-exciton series are resolved up to 12p state in one-photon absorption spectra, while those of the (s-d) excitons are resolved up to 7(s-d) states in two-photon spectra. The band gap energy is evaluated to be 2.1722eV. The different effective Rydberg constants are obtained to be 0.0981 ± 0.0005 eV for p-series, 0.1083±0.0138 eV and 0.1066±0.0014 eV for (s-d) series, respectively.
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