What is auger effect?

Answer 1

When photons of sufficient energy are incident on a surface, an electron is ejected out from the core shell. The electron from the p-orbital or any other orbital of higher energy loses that much energy to fill up the gap created by the loss of this core electron. The energy lost by the p-orbital electron is absorbed by another electron in the same or higher shell, causing it to eject from the atom. This second atom is called the "Auger electron" and the effect is called Auger effect.