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We report optical reflectance spectra near the $n=1$ excitonic resonance of GaAs. The experimental results from crystals cleaved in liquid helium and exposed to air exhibit noticeable changes of the line shape. Comparison with a model based on the adiabatic approximation indicates that line-shape distortions by surface electric fields are unavoidable for air-exposed GaAs surfaces.
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Schultheis et al. (1983) studied this question.
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