Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.083002
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences
- DOE/BES [DE-FG02-04ER15614, DE-AC02-06CH11357, DE-FG02-92ER14299, DE-AC52-07NA27344]
- U.S. Department of Energy (DOE) [DE-FG02-92ER14299] Funding Source: U.S. Department of Energy (DOE)
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The 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.
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