On the similarities of Stark broadening parameters within a Fe XXV multiplet

Stark broadening parameters, line widths and shifts, have been calculated for spectral lines within Fe XXV 3s²S_J-3p²P^o_J' multiplet, by using the impact semiclassical perturbation theory. The obtained results have been used to demonstrate, that in spite of big differences of line width values expressed as usual in Å, they are practically the same when expressed in angular frequency units. This confirms that in the case of Fe XXV spectral lines we can use the known Stark broadening parameters, expressed in angular frequency units, to obtain the unknown ones, for other lines in the same multiplet. The obtained data are particularly interesting for neutron star atmospheres and environment investigation and modelling as well as for inertial fusion plasma.