First high-resolution analysis of the nu sub(1), nu sub(3) and nu sub(1) + nu sub(3) bands of sulphur dioxide super(33)S super(16)O sub(2)

• Published in: Molecular physics Vol. 115; no. 4; pp. 447 - 453
• Main Authors: Flaud, J-M, Blake, T A, Lafferty, W J
• Format: Journal Article
• Language: English
• Published: 16.02.2017
• Subjects: Band spectra; Distortion; Fourier transforms; Molecular physics; Spectra; Sulfur dioxide; Uncertainty; Vibrational states
• ISSN: 0026-8976; 1362-3028
• DOI: 10.1080/00268976.2016.1269966

Fourier transform spectra of sulphur dioxide super(33)S super(16)O sub(2) have been recorded in the 8.0 and 4.0 mu m spectral regions at a resolution of 0.0015 cm super(-1) using a Bruker IFS 125HR spectrometer leading to the observation of the nu sub(1), nu sub(3) and nu sub(1) + nu sub(3) vibrational bands of the super(33)S super(16)O sub(2) molecule. The corresponding upper state ro-vibrational levels were fit using a Hamiltonian matrix taking into account a Coriolis Delta K sub(a)= 3 resonance between the ro-vibrational levels of the 1 super(1) and 3 super(1) vibrational states and a Watson-type Hamiltonian for the ro-vibrational levels of the 1 super(1) 3 super(1) vibrational state. In this way it was possible to reproduce the upper state ro-vibrational levels to within the experimental uncertainty; i.e. similar to 0.20 10 super(-3) cm super(-1). Very accurate rotational and centrifugal distortion constants were derived from the fit together with the following band centres: nu sub(0) ( nu sub(1)) = 1147.979535(60) cm super(-1), nu sub(0) ( nu sub(3)) = 1353.335912(60) cm super(-1) and nu sub(0) ( nu sub(1) + nu sub(3)) = 2487.493732(30) cm super(-1).