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

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 extre...

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Veröffentlicht in:Physical review applied 2020-09, Vol.14 (3), Article 034057
Hauptverfasser: Burian, T., Chalupský, J., Hájková, V., Toufarová, M., 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, R., Tiedtke, K., de Grazia, M., Auguste, T., Carré, B., Guizard, S., Merdji, H., Medvedev, N., Juha, L.
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container_issue 3
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container_title Physical review applied
container_volume 14
creator Burian, T.
Chalupský, J.
Hájková, V.
Toufarová, M.
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, R.
Tiedtke, K.
de Grazia, M.
Auguste, T.
Carré, B.
Guizard, S.
Merdji, H.
Medvedev, N.
Juha, L.
description 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 eVin 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.
doi_str_mv 10.1103/PhysRevApplied.14.034057
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source American Physical Society Journals
subjects chemical physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
desorption
free-electron lasers
laser ablation
light-matter interaction
Mechanics
Mechanics of materials
physical chemistry
Physics
polymer theory
polymer thin films
x-ray lasers
title Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser
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