Abstract
Resonance lines of ions with a large Z are broadened essentially by natural damping, and therefore photons with frequencies larger than a few Doppler widths are scattered almost coherently. This "coherent" scattering of resonance-line photons can be described by a space and frequency diffusion process when the mean number of scatterings undergone by the photons is sufficiently large. Some asymptotic scaling laws for the radiation field of these resonance lines are given (in terms of the mean number of scatterings), and an approximation for the mean number of scatterings in a dissipative slab is suggested.
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