Azbel-Kaner resonance is 
Azbel-Kaner resonance is used to measure the derivative d-A over d-E of this structure. The Harrison construction is used to visualize this structure when employing the nearly free electron model. Alfred Pippard studied this structure by measuring the surface impedance when the electron mean free path is much greater than the skin depth. A way to map it came from Onsager's derivation that 2 pi e over h-bar times the extremal cross-sectional area of this structure normal to the magnetic field is the period of the magnetic moment, in units of one over the magnetic field, when employing the (*) de Haas-van Alphen effect. For 10 points, name this 3- dimensional surface of constant energy in a crystal's reciprocal space, below which all available states are filled at absolute zero.
Azbel-Kaner resonance is used to measure the derivative d-A over d-E of this structure.