Abstract
The transmission spectrum has been calculated using a detailed-level-accounting model for iron plasmas in local thermodynamic equilibrium in the 2p-3d excitation energy region. The calculation is motivated by the large difference between the theories obtained by statistical methods such as unresolved transition array and superconfiguration transition array and the experiment reported in the literature. Detailed studies have been carried out on the effects of the width of individual lines and configuration interaction. The results show that the saturation of individual lines is evident in the transmission. These effects should be considered carefully to obtain an accurate opacity or transmission. In view of the uncertainties in the experiment, rather good agreement is found between our theoretical result and the experiment when these effects are taken into account in the calculation.
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