Abstract
We present calculations of Gaunt factors for free–free absorption over a wide range of temperatures and densities. The calculations employ a partial wave expansion approach, which is able to account for plasma screening within the calculation of the free–free Gaunt factor. Much of the existing Gaunt factor data pertains to hydrogenic systems, and plasma screening is often incorporated in opacity calculations using approximate methods. The use of a more accurate method allows us to determine the accuracy of such approximations in calculations of the free–free monochromatic and mean opacities.
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