The ν2 + ν3 and ν2 + ν3 − ν2 Bands of 14N16O2: Line Positions and Intensities

Abstract

High-resolution Fourier transform spectra recorded in the 2270-2400 cm−1 and 1520-1600 cm−1 spectral regions have been used to measure, up to very high N values, the positions of lines with Ka = 0-9 of the ν2 + ν3 and ν2 + ν3 − ν2 bands of 14N16O2 as well as their absolute intensities and a self broadening coefficient γ0 = 0.095 ± 0.032 cm−1 atm−1 (at 292 K). The spin-rotation energy levels were very satisfactorily reproduced using a theoretical model which explicitly takes into account both the Coriolis interaction between the spin-rotation levels of the (011) vibrational state and those of (030), and the spin-rotation resonances within (011) and (030). As a consequence, precise vibrational band centers and rotational, spin-rotation, and coupling constants were obtained for the diad {(030), (011)} of interacting states for 14N16O2. In addition, using a large set of individual ν2 + ν3 line intensities, we have determined precisely the ν2 + ν3 transition moments of 14N16O2. On the other hand, the transition moments of the ν2 + ν3 − ν2 and 3ν2 − ν2 bands were derived from those of the corresponding ν3 and 2ν2 cold bands. Finally, a comprehensive list of line positions and intensities of the interacting {ν2 + ν3, 3ν2} and {ν2 + ν3 − ν2, 3ν2 − ν2} bands of 14N16O2 has been generated at 4.2 and 6.2 μm, respectively.