Effects of Temperature Relaxations on Waves in a Homogeneous Plasma

Abstract

With use of the Boltzmann equation, dispersion relations are derived for electron mode by taking account of momentum transfer, electron-ion temperature relaxation and relaxation of anisotropy in temperature. Ions are regarded to be a heat bath of infinitely large capacity. The dispersion relations are given in the forms of wavenumber expansion.
The momentum transfer collision gives damping of waves. The relaxation of anisotropy in temperature also causes damping. The electron-ion temperature relaxation gives additional damping only for longitudinal wave, but not for transverse one. An explanation of this is given.