The {2ν3, 4ν2, 2ν2+ ν3} and 2ν3− ν3Bands of14N16O2: Line Positions and Intensities

Abstract

High resolution Fourier transform absorption spectra of the14N16O2molecule recorded in the 3000–3400 cm−1and 1520–1600 cm−1spectral regions have been analyzed. In this way lines of the 2ν3, 4ν2, 2ν2+ ν3, and 2ν3− ν3bands of14N16O2have been assigned withKavalues ranging from 0 to 8 andNvalues up to 60. The spin–rotation energy levels were very satisfactorily reproduced using a theoretical model which takes explicitly into account both the Coriolis interaction between the spin–rotation levels of the (021) vibrational state and those of (040) and of (002), and the spin–rotation resonances within (021), (040), and (002). As a consequence, precise vibrational band centers and rotational, spin–rotation, and coupling constants were obtained for the triad {(040), (002), (021)} of interacting states of14N16O2. In addition, using a large set of individual 2ν3, 4ν2, and 2ν2+ ν3experimental line intensities at 3.2 μm, we have determined precisely the 2ν2+ ν3and 2ν3transition moment constants of14N16O2. On the other hand, the transition moment constants of the 2ν3− ν3and 2ν2+ ν3− 2ν2bands were derived from those of the corresponding ν3cold band. Finally, a comprehensive list of line positions and intensities of the interacting 4ν2, 2ν3, 2ν2+ ν3, and 2ν3− ν3bands of14N16O2has been generated at 3.2 μm and 6.2 μm, respectively.