Abstract
In this work we present the main results concerning an accurate line shape analysis on acetylene lines in the spectral region around $3\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$. We clearly demonstrate the influence of Dicke narrowing as well as correlations between velocity-changing and dephasing collisions and the speed-dependent effects on Xe-broadened lines. In the low pressure regime the correlations are the main effect responsible for the line asymmetry while for high pressure (several hundred Torr) the speed-dependent effects predominate. This work constitutes the experimental evidence of the influence of such kind of effects on the line profiles of a nonpolar molecule, except ${\mathrm{H}}_{2}$. The influence of the choice of the theoretical profile describing the line shape on the fitted line parameters is also discussed and the Xe-broadening and shift parameters were found for six ${\mathrm{C}}_{2}{\mathrm{H}}_{2}$ lines.
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