On systematic errors in spectral line parameters retrieved with the Voigt line profile

Systematic errors inherent in the Voigt line profile are analyzed. Molecular spectrum processing with the Voigt profile is shown to underestimate line intensities by 1-4%, with the errors in line positions being 0.0005 cm−1 and the decrease in pressure broadening coefficients varying from 5% to 55%.

► Systematic errors of the Voigt line profile (VP) in intensities are 1-5%. ► Systematic errors of the VP in line centers are ∼0.0005 cm−1. ► Systematic errors of the VP in collision line widths vary in the range 5−55%.