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Abstract
AbstractThe reflection and gain spectra of CdS and ZnO are investigated as a function of excitation intensity and temperature. For the gain spectroscopy the two beam method and the variation of the excitation strip length are used. The results indicate, that an electron–hole plasma is formed under high excitation, preferentially if small excitation spots are used. The electron–hole plasma comes close to its thermal equilibrium only in especially favourable cases. Excitonic recombination processes are predominant, if larger excitation spots are used.
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