Two-Photon Absorption of Soft X-Ray Free Electron Laser Radiation by Graphite Near the Carbon K-Absorption Edge

  • Steven Christensen
  • , Royce Lam
  • , Sumana Raj
  • , Tod Pascal
  • , C. Pemmaraju
  • , Laura Foglia
  • , Alberto Simoncig
  • , Nicola Fabris
  • , Paolo Miotti
  • , Christopher Hull
  • , Anthony Rizzuto
  • , Jacob Smith
  • , Riccardo Mincigrucci
  • , Claudio Masciovecchio
  • , Alessandro Gessini
  • , Giovanni Ninno
  • , Bruno Diviacco
  • , Eleonore Roussel
  • , Simone Spampinati
  • , Giuseppe Penco
  • Simone Mitri, Mauro Trovo, Miltcho Danailov, Dimosthenis Sokaras, Tsu-Chien Weng, Marcello Coreno, Luca Poletto, Walter Drisdell, David Prendergast, Luca Giannessi, Emiliano Principi, Dennis Nordlund, Richard Saykally, Craig Schwartz

Research output: Contribution to journalArticlepeer-review

10 Scopus Citations

Abstract

We have examined the transmission of soft X-ray pulses from the FERMI free electron laser through carbon films of varying thickness, quantifying nonlinear effects of pulses above and below the carbon K-edge. At typical of soft X-ray free electron laser intensities, pulses exhibit linear absorption at photon energies above and below the K-edge, ~308 and ~260 eV, respectively; whereas two-photon absorption becomes significant slightly below the K-edge, ~284.2 eV. The measured two-photon absorption cross section at 284.18 eV (~6 x 10-48 cm4 s) is 7 orders of magnitude above what is expected from a simple theory based on hydrogen-like atoms - a result of resonance effects.
Original languageAmerican English
Pages (from-to)112-116
Number of pages5
JournalChemical Physics Letters
Volume703
DOIs
StatePublished - 2018

NLR Publication Number

  • NREL/JA-5K00-71689

Keywords

  • K-edge
  • linear absorption
  • transmission geometry
  • two-photon absorption

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