ON LONGITUDINAL OSCILLATIONS IN STRONGLY COUPLED PLASMAS

Some features of plasma oscillations in strongly coupled (nonideal) equilibrium plasmas are investigated. Attention is paid to the character of the plasmon damping, the dispersion relation and the thermal level. Calculations are made of the spectra and the decrements of collisional and nonresonant damping of plasma oscillations. The long-wavelength plasma oscillations turn out to be well-defined in collision-dominated nonideal plasmas. Estimations of the thermal level of plasma oscillations are performed, taking into account well- and poorly-defined modes. Due to the relatively high thermal levels, the oscillations can manifest themselves in the properties of strongly coupled plasmas and should also be taken into account in spectral diagnostics of dense plasmas. The results obtained are compared with the available theoretical approximations and both the computer and laboratory experimental data. © 1990.