Nonlinear atomic response to intense ultrashort x rays

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Erscheinungsjahr:
2011
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Text
Beschreibung:
  • The nonlinear absorption mechanisms of neon atoms to intense, femtosecond kilovolt x rays are investigated. The production of Ne9+ is observed at x-ray frequencies below the Ne8+, 1s2 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 Ne8 + 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.
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  • info:eu-repo/semantics/restrictedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/3e74cd64-5ee1-4614-89da-49bbdafda30e