Plasma composition and diffusion in the near-wall region of a capillary discharge

The internal structure of the discharge plasma in a capillary with evaporating walls made of the compounds $\rm CH_2$ and $\rm CF_2$ is considered. The experimental data obtained for the central region make it possible to identify two near-wall layers (rings) with their own plasma composition characteristics and transfer process kinetics. The mechanisms of radial separation of the mixture components have been established, starting with thermal diffusion in a neutral gas near the wall and enhanced by ambipolar diffusion of carbon ions with electrons from the ionized layer of the near-wall region. As a result, movement of the lightweight component towards the center is accelerated many times, while the heavy component slows down so that the central region is filled with light gas $(\rm H$ or $\rm C$ ions$)$ and the near-wall region is predominantly filled with heavy gas $(\rm C$ atoms and ions or $\rm F$ atoms$)$. Directions for further research are identified.