Collisional line-shape parameters and their temperature dependence for the ν1+ν3 band of C2H2 perturbed by CO2

• DOI: 10.1016/j.jqsrt.2017.02.002
• Publication Date: 2017-02-07T18:30:35Z
• Authors: K. Esteki; A. Al Mashwood; A. Dudaryonok; J. Buldyreva; A. Predoi-Cross; N. Prakash; D. Sutherland; O. Guerrero Medina; N. Lavrentieva
• Keywords: Line (geometry); Voigt profile

Abstract CO2-broadened line widths and CO2-pressure induced line shifts have been measured for 42 R- and P-branch transitions in the ν1+ν3 band of acetylene at seven temperatures in the range 216–333 K to obtain the temperature dependences of broadening and shift coefficients. The spectra were recorded by a 3-channel tunable diode laser spectrometer, and the traditional Voigt-profile model was employed to retrieve the line parameters with a multispectrum fitting procedure. The line-broadening and line-shifting coefficients as well as their temperature-dependence parameters have been also evaluated theoretically, in the frame of a semi-empirical approach based on analytical Anderson-type expressions and including a few-parameter correction to account for the real curved trajectories. Being validated by comparison with measurements, this approach has been used to compute extensive (0≤J≤70) R- and P-line lists which could be useful for atmospheric/astrophysical applications and spectroscopic databases.