Fourier transform absorption spectrum of in 7360–8440cm−1 spectral region

Abstract: The high-resolution Fourier-transform spectrum of the D2 16O molecule is recorded and analyzed in the region near (7360–8440cm−1) where the bands of the V=3 (V=v 1+v 2/2+v 3) polyad are located. A total of 2772 transitions have been assigned based on recent variational calculation of Shirin et al. [JQSRT 2008;109:549–58]. A set of 1094 energy levels (564 of which are new) is determined for nine vibrational states including those of newly reported (102) and (220) states. Calculations using an effective Hamiltonian are performed to establish reasonable ro-vibrational labeling of the observed energy levels. The latest variational calculation are found to agree well with the experiment for line positions (within 0.026cm−1 on average); however, the calculated intensities for transitions to upper energy levels which are in close resonance with other states can be distorted. [ABSTRACT FROM AUTHOR]