Resonances in a Cylindrical Plasma Column (Correspondence)

A plasma column irradiated by an electromagnetic wave which has its electric vector and direction of propagation perpendicular to the axis of the tube exhibits Tonks-Dattner resonances in its absorption pattern when the electron density in the column is varied. The pattern consists of a main resonance and a number of less pronounced subsidiary resonances at currents corresponding to electron densities lower than that of the main peak. The subsidiary resonances grow progressively smaller as the electron density decreases.