Refined Investigation of the Overtone Spectrum of Nitrous Oxide

Abstract

Following our previous work [A. Campargue, D. Permogorov, M. Bach, M. Abbouti Temsamani, J. Vander Auwera, M. Herman, and M. Fujii, J. Chem. Phys. 103, 5931–5938 (1995)], we reinvestigated the overtone spectrum of nitrous oxide (14N216O) using intracavity laser absorption spectroscopy, observing seven new bands in the spectral range 10 650–12 200 cm−1 and improving the signal-to-noise ratio in two others previously reported using Fourier transform spectroscopy. The earlier FT line positions, in the range 6500–11 000 cm−1, have been calibrated using the 3–0 vibration–rotation line wavenumbers in 12C16O as references. A previously unreported hot band is spotted on the FT spectrum, at 7229 cm−1. Vibration–rotation parameters are provided for all newly analyzed bands and significantly improved for most previously reported FT bands by accounting for more lines in the fitting procedure than earlier. All bands are vibrationally assigned in agreement with theoretical predictions. A table listing all levels above 6500 cm−1 reported in the literature is provided.