Establishing nonlinearity thresholds with ultraintense X-ray pulses
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Jan Kochanowski Univ., Kielce (Poland). Inst. of Physics
- Univ. of Fribourg, Fribourg (Switzerland)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Uppsala Univ. (Sweden). Dept. of Chemistry; Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Physical Chemistry
- 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)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Federal Inst. of Technology, Zurich (Switzerland). Inst. for Chemical and Bioengineering
- 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
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