The {ν1+ 2ν2, ν1+ ν3} Bands of14N16O2: Line Positions and Intensities; Line Intensities in the ν1+ ν2+ ν3− ν2Hot Band

Abstract

High resolution Fourier transform absorption spectra of the14N16O2molecule recorded in the 2630–3510 cm−1spectral region have been analysed and lines of the ν1+ ν3band of this molecule have been assigned forKavalues ranging from 0 to 10 andNvalues up to 55. 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 (101) vibrational state and those of (120) and the spin–rotation resonances within (101) and (120). As a consequence, precise vibrational band centers and rotational, spin–rotation, and coupling constants were obtained for the {(120), (101))} interacting states of14N16O2. In addition, using a large set of individual ν1+ ν3experimental line intensities we have determined precisely the ν1+ ν3transition moment constants. Also from ν1+ ν2+ ν3− ν2line intensities measured in this work, the transition moment operator of the ν1+ ν2+ ν3− ν2hot band was found to be in agreement with the transition dipole moment of the corresponding cold band, namely, ν1+ ν3. Finally, a comprehensive list of line positions and intensities of the ν1+ ν3band of14N16O2has been generated at 3.4 μm.