Cavity ring-down spectroscopy of 14N216O near 0.83 µm

The cavity ring-down spectra (CRDS) of nitrous oxide were recorded at a pressure of 10 hPa in the 11,937–12,223 cm^-1 range with a threshold sensitivity to absorption coefficient of the order of 6.5 × 10^–11 cm^-1. Three bands (ν₁+5ν₃, 6ν₁+2ν₃, and 3ν₁+4ν₃) were detected. The line centers and intensities were recovered from the observed spectra. The spectroscopic constants of the upper vibrational states and the vibrational transition dipole moment parameters were fitted to the measured line positions and intensities, respectively. It was found that the 3ν₁+4ν₃ band is in the interpolyad Coriolis resonance interaction with the $7{\nu }_1+7{\nu }_2^1$ band. This interaction leads to the appearance in the spectra of the four extra lines of the $7{\nu }_1+7{\nu }_2^1$ band.