These parameter values are consistent with the detailed (vibrational state specific) findings of Van Duzor et al., as well as with a similar analysis (disregarding the vibronic effects) by Blackstone et al. For purposes of comparison with SO -, we will use the Cooper-Zare curve shown in Fig. (b) to describe the overall () trend in O2  experimental data. 12 SO  : the p-d mixing model. The number of molecular systems for which the above approach with a single l value may work is limited. As a case in point, it cannot be applied directly to SO  because of the asymmetric (lopsided) character of the π * HOMO (highest occupied molecular orbital) or, more precisely, the Dyson orbitals corresponding to the three lowest photodetachment transitions. To overcome the central-potential limitation, various l-mixing models have been developed in recent years. These models approximate the detachment orbitals as superpositions of two (or more) atomic-like functions with different l values, all placed on the same center in the molecular frame. The s-p mixing approach is useful for hybrid orbitals in organics 2,49-51 and polarization interactions of s type anions in clusters. Of particular relevance to the present work is the p-d variant of l-mixing. Unlike the π * HOMO of O2  , the essential character of the lopsided π * HOMO of SO  cannot be captured by a single l = 2 function; it requires at least one additional component with l = 1. Similar scenarios have been discussed previously for NO  or HO2  . In detachment from a mixed-character orbital described as 𝜓