Theory of Cyclotron Resonance in Metals

The surface impedance of a metal, in the extreme anomalous skin effect region and in the presence of a magnetic field ${\mathbf{H}}_0$ parallel to its surface, is calculated assuming specular reflection and spherical energy bands. We give the surface impedance in the cases in which the microwave electric field is parallel and at right angles with ${\mathbf{H}}_0$, which we call longitudinal and transverse, respectively. The position, intensities, and width of the cyclotron resonance lines are the same for longitudinal and transverse cyclotron resonance.