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Unveiling and Driving Hidden Resonances with High-Fluence, High-Intensity X-Ray Pulses

By E. Kanter, B. Krassig, Y. Li, A. March, P. Ho, N. Rohringer, R. Santra, S. Southworth, L. DiMauro, G. Doumy, C. Roedig, N. Berrah, L. Fang, M. Hoener, P. Bucksbaum, S. Ghimire, D. Reis, J. Bozek, C. Bostedt, M. Messerschmidt and L. Young

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

Topics: YB 2012
Year: 2011
OAI identifier: oai:pure.mpg.de:item_2219748
Provided by: MPG.PuRe
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