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Communication Dans Un Congrès Année : 2008

Current status of the global modeling of the lower three polyads of PH3 (position and intensities)

Résumé

As part of extensive efforts to support remote sensing of Jupiter and Saturn many works have been devoted to the high-resolution infrared spectrum of phosphine. However, at present, the line parameters of phosphine (positions and intensities) in the 3 \mu m region rely essentially on the empirical database reported in 2006. So far, only weakly interacting features could be fitted using isolated band models while strongly interacting states were left out. The goal of the present work is to achieve a comprehensive modeling of the lower three polyads of the molecule. The simultaneous analysis of the dyad, pentad and octad of PH_3 has been undertaken using an effective hamiltonian in the form of irreducible tensors. This model allows to consider all possible ro-vibrationnal interactions and to describe all the vibrational states by a commun set of hamiltonian parameters and by consistent sets of dipole moment operators for cold and hot bands. The analysis includes transitions from the three cold systems : dyad, pentad and octad as well as transitions from the hot systems : octad - dyad and pentad - dyad. This complex analysis based on iterative fits on both positions and intensities alternatively has reached his final stage. The current results will be presented. They represent a significant improvement with respect to previous works as measured by the standard deviations achieved regarding positions and intensities as well.
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Dates et versions

hal-00362813 , version 1 (19-02-2009)

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  • HAL Id : hal-00362813 , version 1

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Andrei Nikitin, Jean-Paul Champion, Rebecca Butler, Linda R. Brown, Isabelle Kleiner. Current status of the global modeling of the lower three polyads of PH3 (position and intensities). The 20th International Conference on High Resolution Molecular Spectroscopy, Sep 2008, Prague, Czech Republic. ⟨hal-00362813⟩
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