Synopsis
Creation of deep core holes leads to extensive nuclear dynamics on a few femtosecond timescale despite the very short (τ ≤ 1 fs) lifetime of such states. This is because the 1st steps of the relaxation processes (i.e. both radiative and non-radiative decays) generate intermediate states with one and multiple holes in core orbitals. As an example, ultrafast dissociation is observed in three well-distinguishable LVV Auger decay channels for HCl following Cl1s→σ* excitation.
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