Experimental and theoretical study of N2-broadened acetylene line parameters in the ν1 + ν3band over a range of temperatures

Abstract:

N2-broadened line widths and N2-pressure induced line shifts have been measured for transitions in the 1þ3band of acetylene at seven temperatures in the range 213–333K to obtain the temperature dependences ofbroadening and shift coefficients. For the room-temperature spectra the line mixing effects have been alsoinvestigated. The Voigt and hard-collision line profile models were used to retrieve the line parameters. Allspectra were recorded using a 3-channel tuneable diode laser spectrometer. The line-broadening and line-shiftingcoefficients as well as their temperature-dependence parameters have been also evaluated theoretically, in theframe of a semi-classical approach based on an exponential representation of the scattering operator, anintermolecular potential composed of electrostatic quadrupole–quadrupole and pairwise atom–atom interactionsas well as on exact trajectories driven by an effective isotropic potential.

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