Research of the density-dependent dielectronic recombination rate coefficient of Ne-like Ni~(+18) in hot dense plasma according to the autoionization state

摘要

In hot dense plasma, the dielectronic recombination (DR) which greatly influences the ionization balance strongly depends on electron density. To research the precise density-dependent DR rate and provide a foundation for further study in hot dense plasmas, a method to calculate the density-dependent DR rate coefficient for highly ionized atoms is provided according to the most important atomic processes changing the population of doubly excited autoionization states. We calculate the density-dependent DR rate coefficient of Ne-like Ni~(18+) ion as one portion of our ongoing work to predict the change of DR rate with increasing electron density and to analyze the effect of those atomic processes on DR rate, which we mostly concern. The coefficient is displayed as a function of temperature at different density so that it is clearer to see the change of the resonant peak. Results show that the DR rate coefficient changes distinctly at density greater than 10~(-21)cm~(-3). At different temperatures, the ways by which the rate coefficients and the peaks of resonance vary with increasing density differ obviously among different channels.