Abstract: UPE spectra are reported for phenylphosphine, p-phenylenediphosphine, phenyldichlorophosphine, p-phenylenebis (dichlorophosphine), phenylbis (diethylamino) phosphine, and p-phenylenebis (diethy1amino) diphosphine. Analysis using PMO theory indicates that the assignments in phenylphosphine and aniline are similar, ZI in each case corresponding to ionization from a perturbed benzene T MO, I3 to a perturbed lone pair. ...