Description of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes

The influence of ion thermal motion on the Stark broadening of spectral lines in plasmas is investigated within the frequency fluctuation method (FFM). The method for the consistent calculation of the jumping frequency, which is the main FFM parameter, is suggested on the basis of the S. Chandrasekhar and J. von Neumann stochastic theory. The calculations of the neutral hydrogen spectra in plasmas are presented. These results are compared with the experimental data. The spectra of the Ar dopant in the deuterium plasma are calculated taking into account ion thermal motion. The effect of ion thermal motion on the dip in the He β spectral line of the He-like Ar ion is shown. The calculations of the He β lineshape of the He-like Ti ion are compared with experimental data.