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Recently, advanced  ab initio  computations were used to generate the three-dimensional potential energy surface (3D-PES) of the phosphine–He (PH 3 –He) van der Waals complex along the intermonomer coordinates. This 3D-PES describes correctly the complex features of the intermolecular interactions between PH 3  and He, which are on the origin of pressure broadening phenomena. At present, we take advantage of this accurate 3D-PES to compute the phosphine line broadenings perturbed by He at room temperature. First, we adjusted this 3D-PES by a new ‘fractional’ function in order to be able to incorporated it into our collisional broadening calculation code. Then, we considered the semi-classical model of Modified Robert and Bonamy improved by so-called the notion of exact trajectory to deduce the He-broadening coefficients of phosphine lines at room temperature. Room temperature data are given in the case of different branches of the parallel,  ν2 , and perpendicular,  ν4 , PH 3  vibrational bands. Our results show an improved agreement with the experimental measurements. This work should be of great help for the precise determination of PH 3  abundances in planetary atmospheres spectra.

Line broadenings of phosphine perturbed by He revisited