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

T. Burian J. Chalupský V. Hájková M. Toufarová V. Vorlíček S. Hau-Riege J. Krzywinski J.D. Bozek C. Bostedt A.T. Graf U.F. Jastrow S. Kreis R.A. London M. Messerschmidt S. Moeller R. Sobierajski K. Tiedtke M. de Grazia T. Auguste 1, 2 B. Carré 1, 2 S. Guizard 1, 3 H. Merdji 1, 2 N. Medvedev L. Juha
2 ATTO - Attophysique
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
3 DICO - Biomolécules Excitées
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
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.
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https://hal-cea.archives-ouvertes.fr/cea-02959110
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Submitted on : Tuesday, October 6, 2020 - 2:49:51 PM
Last modification on : Saturday, October 10, 2020 - 3:25:53 AM

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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, American Physical Society, 2020, 14 (3), ⟨10.1103/PhysRevApplied.14.034057⟩. ⟨cea-02959110⟩

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