Experimental Stark widths and shifts of triply ionized sulfur spectral lines

Stark widths and shifts of two prominent triply ionized sulfur (S IV) ultraviolet spectral lines (309.727 nm and 311.761 nm) in the – transition have been measured in a linear, low-pressure, pulsed arc discharge created in a SF6 plasma at 33 600 K electron temperature and at 2.8 1023 m -3 electron density. Presented Stark shifts are the first measurement of the line shift in the S IV spectrum. Obtained broadening parameters have been compared to the available experimental and theoretical data. The transition probability ratio of the mentioned S IV spectral lines is also obtained.