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Title: Two-photon absorption of soft X-ray free electron laser radiation by graphite near the carbon K-absorption edge

Journal Article · · Chemical Physics Letters

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.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1440738
Report Number(s):
NREL/JA-5K00-71689
Journal Information:
Chemical Physics Letters, Vol. 703, Issue C; ISSN 0009-2614
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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