High Frequency Electronic

The electronic properties of normal metals have been under active study for several decades. In the 1950s and 1960s most investigations sought to describe the Fermi surfaces of metals. These studies were based on experimental data obtained as a re­ sult of numerous observations of particular phenomena responsive to the structure of the electronic spectra of metals and thus to band-structure calculations [lJ. The high-frequency properties of metals were also actively studied.