X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
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 1 keV. In the case of neon, processes are discussed that involve up to seven photons. Assuming an x-ray coherence time of 2.6 fs, double-core-hole formation in neon is found to be statistically enhanced by about 30% at an intensity of 10{sup 16} W/cm{sup 2}.
- OSTI ID:
- 21020548
- Journal Information:
- Physical Review. A, Vol. 76, Issue 3; Other Information: DOI: 10.1103/PhysRevA.76.033416; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
The Physics of Gain Mechanisms in a Self-Amplified Spontaneous Emission Free-Electron Laser
Statistical Analysis of the Chaotic Optical Field from a Self-Amplified Spontaneous-Emission Free-Electron Laser
Related Subjects
ABSORPTION
ATOMS
ELECTRONS
EMISSION
FREE ELECTRON LASERS
HELIUM
IONIZATION
KEV RANGE 01-10
NEON
NONLINEAR OPTICS
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
STATISTICS
WAVELENGTHS
X RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTRA