EA(SO) = 1.125(5) eV vs. EA(O2) = 0.448(6) eV. While the EA consideration agrees with the observed anisotropy results, the above logical chain nonetheless does not stand up to scrutiny. That is because, as we will show shortly, no ab initio treatment of SO  PADs can capture the experimental () trend unless another property distinguishing SO  from O2  is considered-the dipole moment of the neutral residue.