Abstract
Cyclotron resonance effects of the Azbel'-Kaner type have;been observed in lead specimens at 9 kMc/sec and 1.2°k, and effective mass values of the charge carriers have been deduced from the magnetic field dependence of the surface resistance of the specimens. The anisotropy of the surface conductivity of the single crystal specimens in the low field limit was found to be consistent with the existing model of the Fermi surface in load, and from the value of the surface conductivity of a polycrystalline specimen, a value of the total Fermi surface area was found which supports the view that the fourth Brillouin zone in lead is empty.

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