Abstract
A new model for the spectrum of ethylene, utilizing the line-mixing concept for overlapping lines, is presented here. The Lorentzian line shape is assigned to all the lines, with the single transitions having the usual directly pressure-dependent widths, and with overlapping lines considered as a single composite feature having an inversely pressure-dependent width. This model is compared with two sets of data: interferometric data over a range of pressures, and an ad hoc model that matches experimental line spectrum data at a single pressure. Inversely pressuredependent widths are obtained for the two comparisons, and the discrepancy between the results is explained.
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