We report a series of Azbel'-Kaner cyclotron resonance experiments in lead and mercury at wavelengths varying from 9 to 1 mm. We observe that in both metals the electron-phonon relaxation time is frequency dependent (τ∝ω^-2 in lead), and that the effective mass increases slightly for the highest frequency in mercury (3 ±{} 1% at λ=1 mm).
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Goy et al. (1970) studied this question.
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