The first Au III Stark widths

The shapes of 12 doubly ionized gold (Au III) spectral lines have been measured in the laboratory helium plasma at about 16 600 K electron temperature and 7.4×¹⁰²² m⁻³$7.4\times {10}^{22}{\text{ m}}^{\mathrm{-3}}$ electron density. At mentioned plasma conditions the Stark broadening has been found as the dominant mechanism in the Au III line shape formation. Here presented data are the first reported values for Stark widths related to the Au III lines. The modified version of the linear, low-pressure, pulsed arc was used as a plasma source operated in helium with gold atoms, as impurities, evaporated from gold cylindrical plates located in the homogeneous part of the discharge, providing conditions free of self-absorption.