Auger decay/electrons involved transitions

The above analysis suggests that the spectacular effect of the neighboring charge on the single-channel Mg 2p Auger decay has to do with the polarizable Mg 3s orbital that is involved both in the recombination and in the ionization parts of the two-electron transition. Let us consider now a more general situation, in which a polarizable orbital is involved only in the ejection of the Auger electron. An example of such a transition is readily provided by 2s-ionized Mg. Indeed, 2s ionization leads to the process in which... 

As discussed in previous sections, the expression of the intensity for any ionization process always involves a continuum orbital, which may describe the photoelectron in XPS or the secondary emitted electron in Auger decay. In the one-center model the problem is overcome by approximating the molecular continuum orbital by an atomic continuum orbital and finally recurring to available or more easily computable atomic transition moments and two-electron integrals. We have also discussed how the multicenter character of the continuum orbitals can be correctly described by... 

An Auger core-valence-valence (CW) decay (denoted as KW when the core hole is in the K shell) involves a transition from an initial state with a single hole in a core electron energy level to a final state with (at least) two valence level holes. 

---