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Title: X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser

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 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}.

Authors:
;  [1]
  1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
21020548
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 76; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.76.033416; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 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

Citation Formats

Rohringer, Nina, and Santra, Robin. X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.76.033416.
Rohringer, Nina, & Santra, Robin. X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser. United States. https://doi.org/10.1103/PHYSREVA.76.033416
Rohringer, Nina, and Santra, Robin. Sat . "X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser". United States. https://doi.org/10.1103/PHYSREVA.76.033416.
@article{osti_21020548,
title = {X-ray nonlinear optical processes using a self-amplified spontaneous emission free-electron laser},
author = {Rohringer, Nina and Santra, Robin},
abstractNote = {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}.},
doi = {10.1103/PHYSREVA.76.033416},
url = {https://www.osti.gov/biblio/21020548}, journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 76,
place = {United States},
year = {2007},
month = {9}
}