The effect of the nuclear motion on the electronic decay of core hole excited states in molecules

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Abstract
We have measured the vibrational fine structure in the electronic decay spectrum of the N 1s→1πg core electron excited state in molecular nitrogen. The Franck–Condon analysis of the vibrational substructure shows that within the 10−14 s lifetime of the core hole excited state the molecule adjusts to the excited state configuration, characterized by a change in bond length by 0.071 Å. Interference effects due to the short lifetime of the intermediate state play only a minor role.