Stark width and shift measurements of visible Si III lines

A set of experimental Stark width and shift parameters of visible doubly ionized silicon spectral lines is reported in this paper. Measurements have been made on a pulsed plasma generated in a linear discharge lamp filled with a mixture of silane and helium. Electron density and temperature in this plasma range from 0.2 to 0.9 × 10 23 m −3 and from 17 500 to 21 000 K respectively. Electron density has been simultaneously determined by two-wavelength interferometry and from Stark broadening of He i 501.6 nm, He i 728.1 nm and H α lines. Temperature has been simultaneously determined from Boltzmann-plot of He i lines, from absolute emission of He i lines, from Boltzmann-plot of Si ii lines and from Si iii/Si ii intensities ratio. Dependencies of measured Stark parameters with electron density and temperature have been investigated and the final results have been compared with most of the previous experimental data as well as with some theoretical models.