Time-resolved X-ray absorption spectroscopy with a water-window high-harmonic source

Femtosecond X-ray absorption spectroscopy is demonstrated at the carbon K-edge (290 eV) and sulfur L-edges (180–240 eV) and applied to study the photodissociation of CF
4
⁺
and SF
6
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by element-specific core-to-valence transitions.