15min:

S. J. WETZEL AND P. M. CHU, Analytical Chemistry Division, CSTL, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; W. J. LAFFERTY, Optical Technology Division, Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; A. PERRIN AND J. -M. FLAUD, Laboratoire de Photophysique Moleculaire, CNRS, Universite Paris Sud, Bat 210, Campus D'Orsay, F--91405 ORSAY, Cedex, France; PH. ARCAS AND G. GUELACHVILI, Laboratoire de Physique Moleculaire et Applications, CNRS, Universite Paris Sud, Bat 350, Campus D'Orsay, F--91405 ORSAY, Cedex, France; L. BROWN, Jet Propulsion Laboratory, Pasadena, CA 91109, USA.

Using both high resolution (R=0.003~cm^-1) and medium resolution (R=0.12~cm^-1) Fourier transform spectra recorded at LPMA Orsay and Kitt Peak, and at NIST Gaithersburg respectively, it has been possible to measure a large set of individual line intensities for the ₁ and ₃ bands of SO₂ in the 950---1350~cm^-1 spectral region. These intensities were introduced in a least squares fit calculation allowing one to get the expansion of the transition moment operator of the ₁ and ₃ bands of SO₂. For these intensities calculations, the theoretical model takes into account the vibration-rotation interactions linking the upper levels involved in the ₁, 2₂ and ₃ interacting bands of SO₂. Finally a synthetic spectrum of the 10 µm bands of SO₂ has been generated, using for the line intensities the dipole moment expansion determined in this work and for the line positions the parameters and the Hamiltonian matrix given in a previous analysis [J.-M.~Flaud, A.~Perrin, L.~M.~Salah, W.~J.~Lafferty and G.~Guelachvili, J.~Mol.~Spectrosc. 160, 272---278 (1993)].