First high-resolution analysis of the ν1, ν3 and ν1 + ν3 bands of sulphur dioxide 33S16O2

2017-01-20T11:34:15Z (GMT) by J.-M. Flaud T.A. Blake W.J. Lafferty

High-resolution spectra of 33S16O2 have been recorded for the first time in the 8 and 4 µm spectral regions.

The ν1, ν3 and ν1 + ν3 bands of the 33S16O2 have been analysed up to very high quantum numbers.

Accurate ro-vibrational upper states constants have been determined.

High-resolution spectra of 33S16O2 have been recorded for the first time in the 8 and 4 µm spectral regions.

The ν1, ν3 and ν1 + ν3 bands of the 33S16O2 have been analysed up to very high quantum numbers.

Accurate ro-vibrational upper states constants have been determined.

Fourier transform spectra of sulphur dioxide 33S16O2 have been recorded in the 8.0 and 4.0 µm spectral regions at a resolution of 0.0015 cm−1 using a Bruker IFS 125HR spectrometer leading to the observation of the ν1, ν3 and ν1 + ν3 vibrational bands of the 33S16O2 molecule. The corresponding upper state ro-vibrational levels were fit using a Hamiltonian matrix taking into account a Coriolis ΔKa = 3 resonance between the ro-vibrational levels of the 11 and 31 vibrational states and a Watson-type Hamiltonian for the ro-vibrational levels of the 11 31 vibrational state. In this way it was possible to reproduce the upper state ro-vibrational levels to within the experimental uncertainty; i.e. ∼0.20 × 10−3 cm−1. Very accurate rotational and centrifugal distortion constants were derived from the fit together with the following band centres: ν01) = 1147.979535(60) cm−1, ν03) = 1353.335912(60) cm−1 and ν01 + ν3) = 2487.493732(30) cm−1.