Measurement of Stark parameters of HeII P (alpha), P (beta) and P (gamma) spectral lines

This work reports information on the pressure broadened profiles of the HeII P (alpha), P (beta) and P (gamma) spectral lines measured in a pulsed discharge lamp. Information relative to the line shapes, full width at 1/2, 1/4 and 1/8 of the maximum intensity and the dip of the HeII 320.3 nm is provided. The electron density has been determined by two-wavelength interferometry and from the Stark width of the HeI 501.6 nm. and ranges during the HeII emission from 0.54 to 0.64 * 10^(23) m ^ (-3) in the plasma. Temperature (1.7-2.4 eV) has been simultaneously determined from the Boltzmann-plot of HeI and from local thermodynamic equilibrium (LTE) assumptions. The final results have been compared with most of the previous existing data.