Absorption measurements demonstrating the importance of Delta n=0 transitions in the opacity of iron.
1992
Novel opacity calculations, which treat in detail the spectra of medium-{ital Z} ions (Rogers and Iglesias, Astrophys. J. Suppl. Ser. 79, 507 (1992)), produce results that are substantially different from opacity calculations extant in the literature. These new opacities provide solutions to a number of outstanding problems in astrophysics, thus providing an indirect validation of the theory. We report the results of an experiment measuring the photoabsorption in the spectral region from 50 to 120 eV of x-ray-heated iron which corroborate these new opacity calculations.
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