Note that 𝐴 = 0.10 eV  for SO  [solid curve in Fig. ] can be compared to 𝐴 = 0.36 eV  for O2  . The Hanstorp coefficients are generally associated with the "size" of the detachment orbital. For example, if the d components of the two MOs are each described by a hydrogenic function with effective charge 𝜁 , then 𝐴 ∝ 1/𝜁 . That is, the larger the 𝐴 value, the smaller the effective charge, and the more diffuse the corresponding MO. Comparing the 𝐴 values for SO  and O2  , the less diffuse nature of SO  is consistent with its larger detachment energy: