Nonlinear atomic response to intense ultrashort x rays.
G Doumy, C Roedig, S-K Son, C I Blaga, A D DiChiara, R Santra, N Berrah, C Bostedt, J D Bozek, P H Bucksbaum, J P Cryan, L Fang, S Ghimire, J M Glownia, M Hoener, E P Kanter, B Krässig, M Kuebel, M Messerschmidt, G G Paulus, D A Reis, N Rohringer, L Young, P Agostini, L F DiMauro
The Ohio State University, Columbus, Ohio 43210, USA.
Physical review letters 2011 Feb 25The nonlinear absorption mechanisms of neon atoms to intense, femtosecond kilovolt x rays are investigated. The production of Ne(9+) is observed at x-ray frequencies below the Ne(8+), 1s(2) absorption edge and demonstrates a clear quadratic dependence on fluence. Theoretical analysis shows that the production is a combination of the two-photon ionization of Ne(8+) ground state and a high-order sequential process involving single-photon production and ionization of transient excited states on a time scale faster than the Auger decay. We find that the nonlinear direct two-photon ionization cross section is orders of magnitude higher than expected from previous calculations. © 2011 American Physical Society
Citation
G Doumy, C Roedig, S-K Son, C I Blaga, A D DiChiara, R Santra, N Berrah, C Bostedt, J D Bozek, P H Bucksbaum, J P Cryan, L Fang, S Ghimire, J M Glownia, M Hoener, E P Kanter, B Krässig, M Kuebel, M Messerschmidt, G G Paulus, D A Reis, N Rohringer, L Young, P Agostini, L F DiMauro. Nonlinear atomic response to intense ultrashort x rays. Physical review letters. 2011 Feb 25;106(8):083002
PMID: 21405568
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