Temperature dependence of the N2-broadening coefficients of acetylene

In this paper, we present the N2-broadening coefficients of seven rovibrational lines in the ν4+ν5 band of 12C2H2, located around 1330cm-1, measured at five temperatures (173.2, 198.2, 223.2, 248.2, 273.2K). The measurement of these coefficients was realized, with a tunable diode-laser spectrometer coupled with a low temperature absorption cell, in order to determine their temperature dependence. The line parameters were obtained by fitting to the experimental profile the Voigt lineshape and the Rautian and Galatry models taking into account the collisional narrowing. The results have been compared with previous experimental datas and also calculations. Our coefficients of collisional broadening, γ0, obtained at different temperatures as well as the temperature dependence parameter, n, are in satisfactory agreement with previous studies.