This paper deals with recent advances in search for possible types of regularities and systematic trends in the Stark broadening and shift parameters. The emphasis is (i) on the Stark parameters’ dependence on the ionization potential from the upper level of a corresponding transition (which, after being established, is used for the theoretical prediction of these parameters for the spectral lines where not available) and (ii) on the experimental determination of the Stark line broadening and shift parameters of group-IV and -V homologous singly charged ions. The data set obtained in such a way, together with existing experimental and theoretical data, are used to demonstrate the existence of several other types of common regularities in the Stark widths and shifts of the lines originating from the same type of transition of neutral atoms and singly charged ions of the elements along the periodic system.

Stark widths and shifts of the most prominent Ne i i spectral lines originating from 13 multiplets have been measured and compared with existing experimental and theoretical results. A linear pinch discharge was used as a plasma source. Electron densities determined with single-wavelength laser interferometry using the visible λ=632.8 nm transition of a He-Ne laser cover the range of (0.30–1.42)×${10}^{23}$ ${\mathrm{m}}^{\mathrm{-}3}$. The electron temperature, in the range of 22?0–40?0 K, was determined from the Boltzmann slope of several Ne i i spectral lines and from the relative intensity ratios of several Ne i–Ne i i lines. Experimental Stark width data of Ne i i spectral lines agree well with existing experimental and theoretical results. Stark shift experimental data disagree with existing theoretical data in some cases up to factor of 3. Our data and those of other authors were used to investigate the nature of Stark broadening and shift dependence on the upper-level ionization potential of the corresponding spectral line belonging to 3s-3p and 3p-3d transition arrays and to the np-nd Ne i i, Ar i i, Kr i i, and Xe i i homologous sequence.