Abstract
We present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the O1s→4a 1 resonance. The core-excited H 2O molecules are shown to dissociate into core-excited O *H and neutral H on a time scale comparable to the core hole lifetime, i.e. a few femtoseconds. This conclusion is based on a resonant Auger study, qualitative arguments and ab initio calculations. `Hot bands' connected to Auger transitions from vibrationally excited OH fragments are identified, and these exhibit a dynamical behavior which qualitatively follows the change in excess energy.
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