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L. SAGUI, I. KLEINER, Laboratoire de Photophysique Moléculaire, Université Paris Sud, 91405 Orsay Cedex, France; R. A. H. BUTLER AND L. R. BROWN, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
Seven absorption bands of PH3 at 3 µm, i.e 3
2, 2
2 +
4, 2
4 +
2,
1 +
2,
3 +
2,
3 +
4 and
1 +
4 were simultaneously analysed from spectra recorded at a resolution of 0.012 cm-1 using the Fourier transform spectrometer located at the Kitt Peak Observatory. A theoretical model suited to the strong vibro-rotational couplings among the seven bands was used. Using ground state combination differences, several hundred transitions have been assigned for these seven bands in the range 2750--3600 cm-1. At present a set of 33 energy parameters was required to reproduce the experimental wavenumbers for six bands with an overall standard deviation of 0.1~cm-1 up to J = 9. 1355 lines were also measured and their analysis is underway. The final objective is to provide a complete prediction of line positions and intensities of Phosphine at 3 µm for remote sensing of Saturn.