Collisional-radiative recombination of Ne$^{++}$ and Ne$^+$ ions with electrons in the decaying plasma of a low-pressure barrier discharge

The results of an experimental study and simulation of radiation generated by the processes of collisional-radiative recombination of neon ions Ne$^+$ and Ne$^{++}$ with electrons of the decaying plasma are presented. Plasma was created by a barrier discharge in a cylindrical glass tube with electrodes on its surface. Experimental conditions: neon pressure 0.65 Torr, electron density at the initial stage of the afterglow $[e]\sim$ (1-5) $\cdot$ 10$^{11}$ cm$^{-3}$. The main attention is paid to the comparative analysis of the collisional-radiative recombination of Ne$^+$ and Ne$^{++}$ ions based on the numerical solution of coupled differential equations for the densities of charged and long-lived excited particles and the electron temperature, taking into account the main elementary processes in decaying neon plasma. Comparison of the model solutions with the intensities of ionic and atomic spectral lines measured by the multichannel photon counting method indicates the need to refine the dependence of the rate of collisional-radiative recombination on the ion charge.