Pressure broadening of phosphine lines by helium and argon at room temperature has been experimentally investigated by high-resolution diode-laser spectroscopy. The broadening coefficients are measured for 38 transitions of PH in the R branch of the ν band and in the P and P branches of the ν band. The recorded lines with J values ranging from 3 to 14 and K from 0 to 10 are located between 1062 and 1094 cm. The retrieval of the collisional widths is carried out by fitting each spectral line with a Voigt profile, a Rautian profile and a speed-dependent Rautian profile. The latter model provides larger broadening coefficients than the Voigt model. They are also calculated on the basis of a semiclassical model involving the atom-atom Lennard-Jones potential. The theoretical results are in reasonable agreement with the experimental data and reproduce the J and K dependencies of the broadenings.
Salem, J., Aroui, H., Bouanich, J-P., Walrand, J., & Blanquet, G. (2005). Helium- and argon-broadening coefficients of phosphine lines in the ν2 and ν4 bands. Journal of molecular spectroscopy, 232(2), 247-254. https://doi.org/10.1016/j.jms.2005.04.014