Manifestation of substituent effects in the Auger parameter

The Auger parameter is composed of contributions from both Auger and photoelectron energies; it is held to be a function of only extra-atomic relaxation (i.e., ligand polarization). Its correlation with the Hammett-Taft inductive substituent constant demonstrates this to be true. Further, both the Auger and photoelectron energies are also demonstrated to correlate with the same substituent constant. This fact is used to separate direct and indirect contributions to the extra-atomic relaxation.