Breadths of resonant photoemission satellites and electron-excited direct-recombination emission

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Abstract
Resonant photoemission involving core-hole excitation and electron emission arising from direct recombination of electron-excited resonant states are compared. At fixed photon energy the resonant emission has an energy distribution which is not broadened by the finite lifetime of the core hole and is therefore narrower than the corresponding Auger emission process. Electron-excited resonant states give rise to emission which can be isolated only if it is at a different energy from that of the main Auger channel as in the rare earths, but this emission is core-hole broadened. A coincidence experiment monitoring the energy loss of the incident electron and the energy distribution of the emitted electron is equivalent in resolution to resonant photon excitation.