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

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 o…