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Title: Establishing nonlinearity thresholds with ultraintense X-ray pulses

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep33292· OSTI ID:1340403
 [1];  [2];  [2];  [3];  [2];  [3];  [4];  [5];  [6];  [7];  [3];  [3];  [8];  [3];  [3];  [3];  [9];  [3];  [3]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Jan Kochanowski Univ., Kielce (Poland). Inst. of Physics
  2. Univ. of Fribourg, Fribourg (Switzerland)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  4. Uppsala Univ. (Sweden). Dept. of Chemistry; Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Physical Chemistry
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); National Science Foundation BioXFEL Science and Technology Center (STC), Buffalo, NY (United States)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); Brookhaven National Lab. (BNL), Upton, NY (United States)
  8. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Federal Inst. of Technology, Zurich (Switzerland). Inst. for Chemical and Bioengineering
  9. Jan Kochanowski Univ., Kielce (Poland). Inst. of Physics

X-ray techniques have evolved over decades to become highly refined tools for a broad range of investigations. Importantly, these approaches rely on X-ray measurements that depend linearly on the number of incident X-ray photons. The advent of X-ray free electron lasers (XFELs) is opening the ability to reach extremely high photon numbers within ultrashort X-ray pulse durations and is leading to a paradigm shift in our ability to explore nonlinear X-ray signals. However, the enormous increase in X-ray peak power is a double-edged sword with new and exciting methods being developed but at the same time well-established techniques proving unreliable. Consequently, accurate knowledge about the threshold for nonlinear X-ray signals is essential. Here in this paper we report an X-ray spectroscopic study that reveals important details on the thresholds for nonlinear X-ray interactions. By varying both the incident X-ray intensity and photon energy, we establish the regimes at which the simplest nonlinear process, two-photon X-ray absorption (TPA), can be observed. From these measurements we can extract the probability of this process as a function of photon energy and confirm both the nature and sub-femtosecond lifetime of the virtual intermediate electronic state.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF); National Science Centre, Poland
Grant/Contract Number:
SC00112704; AC02-76SF00515; 135040; 2015/19/B/ST2/00931
OSTI ID:
1340403
Report Number(s):
BNL-113187-2016-JA
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (17)

Core-level nonlinear spectroscopy triggered by stochastic X-ray pulses journal October 2019
Perspective: Opportunities for ultrafast science at SwissFEL journal November 2017
Nonlinear XUV-optical transient grating spectroscopy at the Si L 2,3 –edge journal May 2019
Fluorescence polarization as a precise tool for understanding nonsequential many-photon ionization journal July 2019
Nonsequential two-photon absorption from the K shell in solid zirconium journal October 2016
Photoelectron distribution of nonresonant two-photon ionization of neutral atoms journal July 2017
Resonant inelastic scattering of two x-ray photons by a many-electron atom journal December 2018
Nonlinear Spectroscopy with X-Ray Two-Photon Absorption in Metallic Copper journal August 2018
Short-wavelength free-electron laser sources and science: a review text January 2017
SwissFEL: The Swiss X-ray Free Electron Laser journal July 2017
Perspective: Opportunities for ultrafast science at SwissFEL text January 2017
Perspective: Opportunities for ultrafast science at SwissFEL text January 2017
Short-wavelength free-electron laser sources and science: a review journal October 2017
Photoelectron distribution of non-resonant two-photon ionization of neutral atoms text January 2017
A Dispersive Inelastic X-ray Scattering Spectrometer for Use at X-ray Free Electron Lasers journal September 2017
Breakdown of the electric dipole approximation at Cooper minima in direct two-photon ionisation text January 2020
Photoelectron Angular Distributions of Nonresonant Two-Photon Atomic Ionization Near Nonlinear Cooper Minima text January 2020

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