Stark widths and shifts of Ne II spectral lines.

Abstract

Stark widths and shifts of the most prominent Ne ii 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 \ensuremath{\lambda}=632.8 nm transition of a He-Ne laser cover the range of (0.30--1.42)\ifmmode\times\else\texttimes\fi{}${10}^{23}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$. The electron temperature, in the range of 22?0--40?0 K, was determined from the Boltzmann slope of several Ne ii spectral lines and from the relative intensity ratios of several Ne i--Ne ii lines. Experimental Stark width data of Ne ii 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 ii, Ar ii, Kr ii, and Xe ii homologous sequence.