Abstract
This paper is an extension of the previous work, on surface characterization by the analysis of i.r. plasma reflectivity spectra. It is now shown that the apparent variations in the effective mass value, due to the presence of a damaged surface layer, can be approximately correlated with the nature of the surface. It has also been shown that the observation of a smaller optical relaxation time by the plasma reflectivity method compared to the corresponding d.c. relaxation time has nothing to do with the surface effects. Instead, the presence of a damaged surface layer always results in an increased estimate of relaxation time.
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