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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