Abstract
The cyclotron resonance of conduction electrons in AgBr has been measured at 136 GHz and at 891 GHz. The apparent effective 'mass' of the electrons is greater by 5.2 per cent at the higher frequency. This increase is compared with the predictions of polaron theory. Good agreement exists with a variational calculation by Larson which assumes the interaction Hamiltonian of Frohlich and a wavefunction based on a modified one-phonon Tamm-Dancoff approximation.
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