Net emission coefficients of argon-iron plasmas

This work presents net emission coefficients for argon-iron plasmas for temperatures from 3000 to 30000~K and iron fractions from 0 to 100~\%. Net emission coefficient avoid the numerical costs of an exact treatment of the radiation transport equation for elements with a multitude of spectral lines, so that the results presented here are useful for the modelling of welding arc. Next to spectral lines the results presented here take into account free-free and bound-free transitions. The broadening of the spectral lines is dominated by quadratic Stark broadening. Their Stark widths are calculated using semiclassical broadening theory. For each species a mean scaling factor for the Stark widths is determined by comparison with published experimental Stark widths measured at several electron densities and temperatures. Additionally, calculated side-on spectral radiances are compared with measurements from a gas metal welding arc. The presented results are in good agreement with previous net emission coefficients for argon-iron plasmas.