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The thermomodulation mechanism for optical transitions originating or terminating near the Fermi surface in noble metals has been investigated. Detailed thermoderivative line shapes of ₂ for both inter-conduction-band transitions and transitions from the d bands to the Fermi surface have been calculated for Ag. The calculation also gives the temperature dependence of the joint density of states for these transitions.
R. Rosei (Mon,) studied this question.