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Probing Matter from Within using Ultra-Intense and Ultra-Fast X-Rays from the LCLS Free Electron Laser

Nora Berrah

Short x-ray pulses from free electron lasers (FEL) open a new regime for all scientific research. The first x-ray FEL, the Linac Coherent Light Source (LCLS) at the SLAC National Laboratory on the Stanford campus, provides intense short pulses that allow the investigation of non-linear and multi-photon processes, including multiple core-holes in atoms, molecules and clusters.

The response of molecular and cluster systems to the ultra-intense, femtosecond x-ray radiation was investigated. Sequential multiphoton ionization, frustrated absorption [1] and double core hole production mechanisms [2,3] in molecules and clusters, as well as future plans, will be presented.

[1] M. Hoener et al., Phys. Rev. Lett. 104, 253002 (2010)

[2] L. Fang et al., Phys. Rev. Lett 105, 083005 (2010).

[3] N. Berrah et al., Proc. Natl. Acad. Sci. USA (PNAS), 108, issue 41, 16912 (2011).