Journal Article

PUBDB-2021-00604

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser

Burian, T. (Corresponding author)Extern*XFEL.EU* ; 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.DESY* ; de Grazia, M. ; Auguste, T. ; Carré, B. ; Guizard, S. ; Merdji, H. ; Medvedev, N. ; Juha, L.

2020
American Physical Society College Park, Md. [u.a.]

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Please use a persistent id in citations: doi:10.1103/PhysRevApplied.14.034057  doi:10.3204/PUBDB-2021-00604

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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Contributing Institute(s):

1. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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