Electromagnetic Radiation of a Nonlinearly Oscillating Charged Drop

Nonlinear oscillations of a charged drop caused by a multimode initial deformation of the equilibrium spherical shape are studied using an asymptotic analytical technique. It is shown that, when the spectrum of modes describing the initial deformation contains two adjacent modes, the center of the drop charge oscillates near the center of mass, which causes the generation of an electromagnetic radiation of the dipole type.