THE OPTICAL PROPERTIES OF DENSE PLASMA
This chapter presents the optical properties of dense low temperature plasma. Basic radiation processes (photoionization, recombination, bremsstrahlung, absorption, reflection) are considered, and the effect of weak nonideality on the spectral line broadening and shift, as well as on the photoionization threshold shift are discussed. As a result of spontaneous violation of the electroneutrality of the plasma on scales of the order of the screening distance, microfields which fluctuate in time occur in the plasma. The microfield distribution function is used to calculate the optical properties of dense plasma. The principle of spectroscopic stability, which consisted of the conservation of the density of oscillator strengths of discrete and continuous spectrum during the superposition of external perturbations (such as interparticle interactions), is substantiated. Lastly, the optical properties of metal plasma in the region of transition of some metals (mercury, alkali metals) from the gaseous plasma state to the fluid-metal state are discussed.
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