Measurements of spectral parameters for nitrous oxide near 4.56 μm using a quantum cascade laser

Abstract Line strengths and nitrogen ( N 2 )-broadening coefficients for six nitrous oxide transitions were measured using a continuous-wave quantum cascade laser (cw-QCL) operating near 4.56 μm. The temperature dependence of the exponent n for the N 2 -broadening coefficients was determined over the range 298–800 K using a sapphire-sealed optical cell. Spectral parameters were determined by fitting absorption spectra with multi-peak Voigt profiles. The line strengths for the six transitions are 0–3% larger than those in the HITRAN 2012 database, while the N 2 -broadening coefficients at the reference temperature are 2–5% smaller than the HITRAN 2012 values.