CO2-broadening coefficients in the ν1 + ν2 and ν2 + ν3 bands of H2S

High-resolution spectra of H₂S perturbed by CO₂ were recorded, at room temperature, using a Bruker IFS 125HR spectrometer covering the range from 3766 to 4018 cm⁻¹ with a resolution of 0.004–0.01 cm⁻¹. A multispectrum fitting procedure was employed to retrieve the spectral line parameters using quadratic speed-dependent Voigt (qSDV) profiles, which reproduced the experimental line shapes within the experimental noise. Line broadening coefficients for 97 H₂S transitions were obtained with an estimated uncertainty of <4% for unblended lines. Semiempirical calculations based on a parametrically modified impact semiclassical model were performed, with the model parameters determined from a fit to the experimental data. The J, Kₐ dependences of the obtained line profile parameters were analyzed.