Abstract
We present evidence for ultra-fast dissociation of molecular ammonia when photo-excited to the N1s→4a 1 core-hole state. This finding is based on resonant Auger spectroscopical results as well as qualitative arguments concerning the photon energy dependence of the Auger structures. Calculations of the excited state potential based on the Z+1 approximation were performed. Both the calculations and the measurements indicate that the most likely fragmentation pathway for the core excited ammonia molecules leads to NH 2 * and H fragments.
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