Abstract
A speed dependent modified Voigt function (MVF) is utilized to describe atomic spectral line profiles and compared to the well known Voigt function (VF). The air—acetylene flame has been used for these comparisons. In all cases the MVF differs from the VF in the calculation of atomic absorption coefficients (up to 15%), full-width half-maximum (FWHM) intensity values (up to 18%), and a-parameter values (up to 80%). The variation between the functions is mass dependent and decreases with atomic weight. The MVF is used to evaluate published lineshape data and reveals a significant difference in calculated collisional cross section values. In addition an experimental situation is evaluated using the MVF and VF to show that the perturber gas in a graphite furnace is important due to its influence on the absorption coefficient at line center.
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