Abstract

Formulas for the direct calculation of convolved photoabsorption cross sections are presented. Atomic parameters used for the calculation of infinite resolution cross sections can be used in a very accurate approximate formula for the convolved cross section. The direct calculation of convolved cross sections is usually 20\char21{}100 times faster than the calculation of numerically convolved cross sections. Numerically convolved cross sections are compared to the preconvolved cross section for a recent atomic calculation.

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