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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−1and 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−1reported in the literature is provided.

A new compact and low-power-consuming cw intracavity laser absorption spectroscopy (ICLAS) spectrometer with a broad tunability near 1.06 μm has been developed. This ICLAS spectrometer uses a thin plate of Nd:glass as the amplification medium and allows pumping by a laser diode. The absorption spectrum of nitrous oxide 14N2 16Ohas been recorded near 9400 cm−1with this new ICLAS apparatus. It reveals an extremely weak absorption band centred at 9398.848 cm−1. The corresponding upper term value, vibrational assignment and Bvrotational constant, as well as the band intensity, are quantitatively discussed in the frame of the vibrational cluster model. The observed atmospheric spectrum in the region is assigned to H2 16Oand discussed.