Analytical prediction of some instabilities in microwave low-temperature plasma

Quantitative analysis of instabilities in microwave low- temperature plasma is carried out by taking into account electron-electron interactions. In particular, it was obtained that S-type negative differential conductivity (NDC) of electrons can be observed in microwave plasma, if this plasma in dc field displays N-type NDC of electrons (both effects have to be compared at the same value of mean electron energy). The conditions for observation of negative radiation temperature are estimated. Radiation temperature in gas mixture is presented as simple function of plasma macroscopic parameters in single gases composing a given mixture.