Quantum-mechanical calculation of Stark widths of Ne VII n=3, Delta n=0 transitions

The Stark widths of the Ne vs 2s3s-2s3p singlet and triplet lines are calcu lated in the impact approximation using quantum-mechanical convergent close -coupling and Coulomb-Born-exchange approximations. It is shown that the co ntribution from inelastic collisions to the linewidths exceeds the elastic width contribution by about an order of magnitude. Comparison with the line widths measured in a hot dense plasma of a gas-liner pinch indicates a sign ificant difference which may be naturally explained by nonthermal Doppler e ffects from persistent implosion velocities or turbulence developed during the pinch implosion. Contributions to the linewidth from different partial waves and types of interactions are: discussed as well. [S1050-2947(99)0320 3-5].