After the photoelectron emission the atom is left in excited state.
The excitation energy equal to the binding energy
of the shell in which the interaction took place. Subsequently the atom emits a fluorescent photon
or Auger or Coster-Kronig electron. The selection of radiative or
non-radiative transition is based on compilation by Krause [].
The Auger or Coster-Kronig transitions are represented by the most probable
line for a given vacancy []. The emitted electron energy
is
where
are the subshell binding energies and
.
In case of fluorescence we use transition rates of Scofield [].
We use only those transitions for which the occurrence probability is not less
than 1%. The fluorescent photon is emitted with energy
for transition between the subshells i and j.
In addition to the above, to fulfill the energy conservation law,
emission of an additional photon is simulated. For non-radiative transitions
its energy is
(see formula 
). In case of fluorescent
transition this photon has energy
(see equation ).
The angular distribution of the emitted particle is isotropic.