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Journal Article

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


Rohringer,  N.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Quantum Optics with X-Rays, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Kanter, E. P., Krassig, B., Li, Y., March, A. M., Ho, P., Rohringer, N., et al. (2011). Unveiling and Driving Hidden Resonances with High-Fluence, High-Intensity X-Ray Pulses. Physical Review Letters, 107(23): 233001.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-8BB2-D
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.