Acoustical phonon assisted two-photon excitation of excitonic molecules and resonant raman scattering in evaporated CuCl films |
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Authors: | K Sôtome Y Nozue M Ueta |
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Institution: | Department of Physics, Faculty of Science, Tohoku University, Sendai 980, Japan |
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Abstract: | In evaporated CuCl films, Chase et al. have concluded the Bose-Einstein condensation of excitonic molecules for the origin of a sharp emission line which has been ascribed so far to the resonant Raman line in single crystals. A trace of the similar works on evaporated samples confirms that the sharp line shifts its energy with the change of the excitation photon energy; indicating the Raman character. When the excitation photon energy exceeds the resonant energy the Raman line shows broadening, and a new emission band appears which can be ascribed to the radiative annihilation of excitonic molecules generated by the two-photon absorption and one acoustical phonon emission. |
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