Abstract
Abstract The fragmentation of the water molecule upon resonant core excitation and subsequent Auger decay has been studied by electron–ion coincidence spectroscopy. A qualitative comparison between the fragmentation patterns for H 2 O and D 2 O reveals that the anti-bonding nature of the core-excited (*) intermediate state causes appreciable dissociation of the H 2 O* (D 2 O*) into HO*+H (DO*+D) during the lifetime (3.3 fs) of the O1s core hole. A `core–hole clock' model is used to derive approximate quantitative values for the characteristic dissociation time of the core-excited water molecule. The results demonstrate how such a procedure is useful for quantitative experiments with a very high degree of spatial and temporal localization.
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