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

•Line strengths and broadening coefficient for six N2O transitions were measured.•Experiments were performed over 298-800 K in an improved mid-infrared optical cell.•Measured line strengths are 0-3% larger than those in the HITRAN 2012 database.•Measured N2-broadening coefficients are 2-5% smaller than the HITRAN 2012 values.

Line strengths and nitrogen (N2)-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 N2-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 N2-broadening coefficients at the reference temperature are 2-5% smaller than the HITRAN 2012 values.