Study of acetylene diluted in xenon by diode-laser spectroscopy: I. Temperature dependence of the broadening coefficients

•Collisional broadening coefficients of acetylene diluted in nitrogen were measured.•Broadening coefficients were obtained by fitting the Voigt, the Rautian and the Galatry profiles.•Temperature dependence of broadening coefficients was determined for five temperatures.•Average values of the temperature dependence parameter are given.•The spectra were measured by high resolution diode-laser.

In this paper, we present the Xe-broadening coefficients of 18 rovibrational lines in the ν4+ν5 band of C212H2 (near 1330 cm−1) determined at five temperatures, ranging from 173.2 K to 298.2 K. The measurement of these coefficients was realized with a tunable diode-laser spectrometer. A low temperature cell was coupled with the spectrometer in order to determine their temperature dependence. The line parameters were obtained by fitting the experimental profiles by the Voigt lineshape and the Rautian and the Galatry models, which take into account the collisional narrowing. The results were compared with previous experimental data reporting for other vibrational bands and agree with them. This indicates that they are insensitive to vibrational excitation.