Stark broadening of spectral lines along the isoelectronic sequence of Li

Experimental Stark widths of the 3s ²3p ²^∘ transitions in the Li-like ions C iv, N v, O vi, and Ne viii are reported. The measurements were performed for a set of plasma parameters so that the density and temperature behavior of the Stark widths could be observed and compared with calculations. The experimental results did not show a scaling with Z^-2, where Z is the spectroscopic charge number, which is expected from theoretical calculations in the electron-impact approximation. Furthermore, deviations from linear scaling appear for Z=8.