Abstract
We report novel results on multiple photoionization of the N2 molecule by femtosecond x-ray pulses from the Linac Coherent Light Source free electron laser. Ion spectroscopy reveals the ionization and dissociation dynamics, including a molecular mechanism of frustrated absorption that suppresses the formation of high charge states at short pulse durations. Auger and photo-electron analysis of double core hole production (through absorption of two photons on the time scale shorter than the Auger decay) agrees well with theory for the case of both K-shell holes on the same N atom, and gives an experimental upper bound for the relative contribution in case of one core hole on each N atom.
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