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In this work we present the main results concerning an accurate line shape analysis on acetylene lines in the spectral region around 30.3em0exμm. 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 H₂. 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 C₂H₂ lines.
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Lisak et al. (2005) studied this question.
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