X-ray two-photon absorption with high fluence XFEL pulses

29th International Conference on Photonic, Electronic, and Atomic Collisions

Hoszowska, J.^1 ; Szlachetko, J.^2,3 ; Dousse, J-Cl^1 ; Blachucki, W.^1 ; Kayser, Y.^2 ; Milne, Ch.^2 ; Pajek, M.^3 ; Boutet, S.^4 ; Messerschmidt, M.^4 ; Williams, G.^4 ; Chantler, C.T.^5

Department of Physics, University of Fribourg, Fribourg

CH-1700, Switzerland^1

Paul Scherrer Institut, Villigen PSI

CH-5232, Switzerland^2

Institute of Physics, Jan Kochanowski University, Kielce

25-406, Poland^3

Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, CA

94025, United States^4

School of Physics, University of Melbourne, Parkville

VIC

3010, Australia^5

关键词: End stations;    Femtoseconds;    High resolution;    Hollow atoms;    Linac Coherent Light Source;    Nonlinear interactions;    Two photon absorption;    X ray emission spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/10/102009/pdf
DOI  :  10.1088/1742-6596/635/10/102009

来源: IOP

【 摘 要 】

We report on nonlinear interaction of solid Fe with intense femtosecond hard x-ray free-electron laser (XFEL) pulses. The experiment was performed at the CXI end-station of the Linac Coherent Light Source (LCLS) by means of high- resolution x-ray emission spectroscopy. The focused x-ray beam provided extreme fluence of ∼105photons/Å2. Two-photon absorption leading to K-shell hollow atom formation and to single K-shell ionization of solid Fe was investigated.