Subthreshold erosion of an organic polymer induced by multiple shots of an X-ray free-electron laser

0533865 - ÚFP 2021 RIV US eng J - Journal Article
Burian, Tomáš - Chalupský, J. - Hájková, V. - Toufarová, Martina - Vorlíček, V. - Hau-Riege, S. - Krzywinski, J. - Bozek, J.D. - Bostedt, C. - Graf, A.T. - Jastrow, U.F. - Kreis, S. - London, R.A. - Messerschmidt, M. - Moeller, S. - Sobierajski, M. - Tiedtke, K. - De Grazia, M. - Auguste, T. - Carré, B. - Guizard, S. - Merdji, H. - Medvedev, Nikita - Juha, Libor
Subthreshold erosion of an organic polymer induced by multiple shots of an X-ray free-electron laser.
Physical Review Applied. Roč. 14, č. 3 (2020), s. 1-14, č. článku 034057. ISSN 2331-7019. E-ISSN 2331-7019
R&D Projects: GA ČR GA19-03314S; GA MŠMT LTT17015; GA MŠMT EF16_013/0001552
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:61389021
Keywords : erosion * X-ray free-electron laser
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 4.985, year: 2020
Method of publishing: Limited access
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.14.034057

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.
Permanent Link: http://hdl.handle.net/11104/0312114