We report on in situ Reflectance Difference Spectroscopy measurements carried out on GaAs (001). Measurements were
performed at temperatures of 580 °C and 430 °C, in both n and p-type doped films and for both (2x4) and c(4x4)
reconstructions. Samples employed were grown by Molecular Beam Epitaxy with doping levels in the range from
1016 - 1019 cm-3. We demonstrate the potential of Reflectance Difference Spectroscopy for impurity level determinations under growth conditions.
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