Measurements and Calculations of the Coefficients of N2O Line Broadening and Shift by Air Pressure in the (0002) ← (0000) Band

Abstract

Accurate measurements of the concentration of nitrous oxide, a potent greenhouse gas, in the Earth’s atmosphere are important for modeling the radiation balance of our planet. The work presents the measured broadening and shift coefficients of N₂O lines by air pressure at room temperature for 82 rovibrational transitions in the (00⁰2) ← (00⁰0) band; the rotational quantum number m varies from 3 to 54. The measurements were carried out with a Bruker IFS-125M Fourier transform spectrometer with a spectral resolution of 0.0056 cm⁻¹. The calculated line-broadening and shift coefficients were obtained using a semiclassical method modified by introducing a correction factor in the calculation scheme. Our parameters are compared with those presented in the literature and in modern spectroscopic databases. A vibrational dependence of the line halfwidths is revealed for the ν₃ stretching vibration.