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Journal Articles Physical Review Applied Year : 2020

Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser

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T. Burian
  • Function : Author
J. Chalupský
  • Function : Author
V. Hájková
  • Function : Author
M. Toufarová
  • Function : Author
V. Vorlíček
  • Function : Author
S. Hau-Riege
  • Function : Author
J. Krzywinski
  • Function : Author
J.D. Bozek
  • Function : Author
C. Bostedt
  • Function : Author
A.T. Graf
  • Function : Author
U.F. Jastrow
  • Function : Author
S. Kreis
  • Function : Author
R.A. London
  • Function : Author
M. Messerschmidt
  • Function : Author
S. Moeller
  • Function : Author
R. Sobierajski
  • Function : Author
K. Tiedtke
  • Function : Author
M. de Grazia
  • Function : Author
N. Medvedev
  • Function : Author
L. Juha
  • Function : Author

Abstract

Solids irradiated by energetic photons can be eroded in two modes, depending on the radiation intensity. High average, low-peak power sources, e.g., synchrotron radiation and high-order harmonics, induce desorption of the material at a low etch rate. In contrast, high-peak-power radiation from extreme ultraviolet and x-ray lasers usually causes a massive removal of the material even by a single shot. In this contribution, an effective material erosion is reported in PMMA exposed to multiple accumulated pulses generated by the free-electron x-ray-laser Linac Coherent Light Source (LCLS, tuned at a photon energy of 830 eV in this study, operated in Menlo Park at Stanford, CA, USA) at a fluence below the single-pulse ablation threshold. The effect is caused by polymer-chain scissions initiated by single photons carrying enough energy to break the C—C bounds. High efficiency of the erosion is supposed to occur due to a correlation of the single-photon effects. The subthreshold damage exhibits a nonlinear dose dependence resulting from a competition between chain scissions and cross-linking processes. The cross-linking is proven by Raman spectroscopy of the irradiated polymer. Two theoretical models of the x-ray free-electron-laser-induced erosion are suggested, which provide an excellent agreement with the experimental results.

Dates and versions

cea-02959110 , version 1 (06-10-2020)

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Cite

T. Burian, J. Chalupský, V. Hájková, M. Toufarová, V. Vorlíček, et al.. Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser. Physical Review Applied, 2020, 14 (3), ⟨10.1103/PhysRevApplied.14.034057⟩. ⟨cea-02959110⟩
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