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We perform time- and spectrally resolved femtosecond-excitation correlation (FEC) on hexagonal GaN at 10 K. A general procedure to interpret the FEC signal at the exciton energies is presented. By fitting to a rate equation model, we find the bimolecular formation coefficient of the GaN A exciton to be C=1.2×10^-18 cm³ps^-1.
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Pau et al. (1998) studied this question.
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