The intrinsic absorption edge of GaₓIn_1-xP alloys has been investigated by piezomodulation spectroscopy between helium and room temperature. The comparison of modulated reflectivity and transmission spectra gives clear evidence of the participation of L and X conduction minima to the indirect process. At 10^∘{}K, direct determination of the Γ1c-L1c and X1c-L1c crossover compositions (xc=0.68 and xc=0.77, respectively) permits one to resolve the discrepancies existing in the literature on this alloy. The contribution of resonant indirect transitions to Δε₁ is observed for the first time.
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Merle et al. (1977) studied this question.
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