Optical frequency comb Fourier transform spectroscopy of 14N216O at 7.8 µm

We use a Fourier transform spectrometer based on compact mid-infrared difference frequency generation comb source to perform broadband high-resolution measurements of nitrous oxide, $^{14}$N$_2$$^{16}$O, and retrieve line center frequencies the $\nu$$_1$ fundamental band + $\nu$$_2$ - hot band. The spectrum spans 90 cm$^{-1}$ around 1285 with sample point spacing 3 ${\times}$ 10$^{-4}$ (9 MHz). report positions 72 lines in between P(37) R(38), 112 (split into two components e/f rotationless parity) P(34) R(33), uncertainties range 90-600 kHz. derive upper state constants both bands from fit effective ro-vibrational Hamiltonian positions. For band, we observe excellent agreement retrieved those reported recent study by AlSaif et al. using comb-referenced quantum cascade laser [J Quant Spectrosc Radiat Transf, 2018;211:172-178]. determine origin precision one order magnitude better than previous work FTIR Toth [http://mark4sun.jpl.nasa.gov/n2o.html], which is HITRAN2016 data for these bands.