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Stark broadening of spectral lines along the isoelectronic sequence of Li.

A systematic study of experimental Stark widths of 3s-3p and 3p-3d transitions in N III-Ne VI measured in a plasma produced by the gas-liner pinch device is reported. The scaling of measured Stark widths with the spectroscopic charge number Z (Z=3 for N III, etc.) shows appreciable deviations from that predicted by some theoretical calculations in the electron-impact approximation. A strong indication is found that proton collisions influence the linewidth of the 2s2p3s4P0-2s2p3p4D transition in Ne VI in a significant way.