on-site excitation
on-site excitation
In EELS, "on-site excitation" means that the inner-shell excitation occurs spatially only on an excited atom. When excitation of an inner-shell electron to an unoccupied state (band) is considered, since the wavefunction of the inner-shell electron is localized on an atom, if the final state is not overlapped with that wavefunction, the excitation (transition) does not occur. Thus, the ELNES spectrum reveals the anti-bonding state of the excited atom.
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