Abstract
A hand calculation of the Rosseland mean opacity coefficient including line effects for nitrogen at a temperature of 5 eV and a density of 5·94 × 10 -3 g/ cm 3 is described. The most important spectral region for the line contribution is from 10 to 30 eV photon energy. The strong lines arising from the 2 p–3 d transition in different ions are treated by distributing their strength uniformly over an interval of 2 eV spanning the region where their line centers occur. The weaker transitions 2 p → nd, n > 3, are distributed uniformly from the edge of the 2 p → 3 d region up to the continuum. A similar treatment is used for the weaker 2 p → ns lines. The line breadth due to Stark shifts from the field of neighboring ions at statistically distributed distances from the radiating ion is great enough to permit the smeared strength approximation. The Rosseland mean opacity found is K = 4·6 × 10 4 cm 2/ g,, a factor of 2·9 higher than the value neglecting line absorption. This hand calculation is in good agreement with the best modern machine computations.
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