Electron shake-off in neon and the interaction of continuum states

Transition probabilities for shake-off of a 2p electron in a neon atom into the continuum following the creation of a vacancy in the 1s shell by an energetic electron or photon are calculated in the sudden approximation and include the electrostatic interaction between the shake-off electron and the residual ion core. The calculations is based on nonrelativistic Hartree-Fock-Slater wave functions, the residual interaction resulting from the electrostatic term being treated as a perturbation. In the first Born limit as well as in a complete calculation results for the ratio I(^3P)/I(1P = $\text{transition probability to continuum states with}{}^3\text{P}\text{core}\text{transition probability to continuum states with}{}^1\text{P}\text{core are lower than the value 3: 1 predicted by statistics in the independent particle limit}$.