Unveiling and driving hidden resonances with high-fluence, high-intensity x-ray pulses |
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Authors: | Kanter E P Krässig B Li Y March A M Ho P Rohringer N Santra R Southworth S H DiMauro L F Doumy G Roedig C A Berrah N Fang L Hoener M Bucksbaum P H Ghimire S Reis D A Bozek J D Bostedt C Messerschmidt M Young L |
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Institution: | Argonne National Laboratory, Argonne, Illinois 60439, USA. kanter@anl.gov |
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Abstract: | We show that high fluence, high-intensity x-ray pulses from the world's first hard x-ray free-electron laser produce nonlinear phenomena that differ dramatically from the linear x-ray-matter interaction processes that are encountered at synchrotron x-ray sources. We use intense x-ray pulses of sub-10-fs duration to first reveal and subsequently drive the 1s?2p resonance in singly ionized neon. This photon-driven cycling of an inner-shell electron modifies the Auger decay process, as evidenced by line shape modification. Our work demonstrates the propensity of high-fluence, femtosecond x-ray pulses to alter the target within a single pulse, i.e., to unveil hidden resonances, by cracking open inner shells energetically inaccessible via single-photon absorption, and to consequently trigger damaging electron cascades at unexpectedly low photon energies. |
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