Regular Article - Plasma Physics
Non-stationary scattering theory and parametric resonance in ultracold Rydberg plasmas subjected to a perturbation by a terahertz acoustic wave
National Academy of Sciences of Ukraine “Hydroacoustic Branch of Geophysical Institute of NAS of Ukraine”, Preobrazhenskaya 3, 65082, Odessa, Ukraine
Accepted: 7 April 2021
Published online: 28 May 2021
Within the framework of a non-stationary scattering theory formulas for electron scattering cross sections on an arbitrary time-periodic potential are derived. These formulas to a weakly ionized ultracold Rydberg plasma subjected to a perturbation by a terahertz acoustic wave and a laser field are applied. Our result for laser-assisted electron-atom scattering generalizes the Kroll-Watson formula to the case of an elliptically polarized electromagnetic wave. Based on the kinetic approach we discuss a mechanism of the scattering of plasma charges on neutral atoms, vibrating in the field of the external acoustic wave, leading to a renormalization of the electron plasma frequency. Additionally, within the framework of the hydrodynamic approach, we demonstrate the possibility of a parametric resonance amplification of electron and ion density oscillations in weakly ionized two component ultracold Rydberg plasmas under the influence of a laser field and as high-frequency acoustic wave.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021