Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser
- Czech Academy of Sciences (CAS), Prague (Czech Republic); Charles University, Prague (Czech Republic)
- Czech Academy of Sciences (CAS), Prague (Czech Republic)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Deutsches Elektronen-Synchrotron DESY, Hamburg (Germany)
- BioXFEL STC, Buffalo, NY (United States)
- Polish Academy of Sciences (PAS), Warsaw (Poland)
- Service Couches Minces, Saint-Gobain Recherche (France)
- University Paris-Saclay, Gif-sur-Yvette (France)
We report 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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); Czech Science Foundation; Czech Ministry of Education, Youth and Sports
- Grant/Contract Number:
- AC52-07NA27344; 17-05076S; 17-05167S; LLT17015; EF16_013/0001552
- OSTI ID:
- 1884625
- Report Number(s):
- LLNL-JRNL-820010; 1031305; TRN: US2308099
- Journal Information:
- Physical Review Applied, Vol. 14, Issue 3; ISSN 2331-7019
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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