Super-accuracy calculation for the width of a Voigt profile
Abstract
A simple approximation scheme to describe the width of the Voigt profile as a function of the relative contributions of Gaussian and Lorentzian broadening is presented. The proposed approximation scheme is highly accurate and provides accuracy better than 10-17 for arbitrary aLaG ratios. In particular, the accuracy reaches an astonishing 10-34 (quadruple precision) in the domain aLaG less than 0.2371 and aLaG greater than 33.8786.
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