X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser
- 27 September 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 76 (3), 033416
- https://doi.org/10.1103/physreva.76.033416
Abstract
In contrast to the long-wavelength regime, x-ray nonlinear optical processes are characterized in general by sequential single-photon single-electron interactions. Despite this fact, the sequential absorption of multiple x-ray photons depends on the statistical properties of the radiation field. Treating the x rays generated by a self-amplified spontaneous emission free-electron laser as fully chaotic, a quantum-mechanical analysis of inner-shell two-photon absorption is performed. It is demonstrated that double-core-hole formation via x-ray two-photon absorption is enhanced by chaotic photon statistics. Numerical calculations using rate equations illustrate the impact of field chaoticity on x-ray nonlinear ionization of helium and neon for photon energies near . In the case of neon, processes are discussed that involve up to seven photons. Assuming an x-ray coherence time of , double-core-hole formation in neon is found to be statistically enhanced by about 30% at an intensity of .
Keywords
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