| Title: |
Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser |
| Authors: |
Burian, Tomas; Chalupský, J.; Jastrow, U. F.; Kreis, S.; London, R. A.; Messerschmidt, M.; Moeller, S.; Sobierajski, R.; Tiedtke, K.; de Grazia, M.; Auguste, T.; Carré, B.; Hájková, V.; Guizard, S.; Merdji, H.; Medvedev, N.; Juha, L.; Toufarová, M.; Vorlíček, V.; Hau-Riege, S.; Krzywinski, J.; Bozek, J. D.; Bostedt, C.; Graf, A. T. |
| Source: |
Physical review applied 14(3), 034057 (2020). doi:10.1103/PhysRevApplied.14.034057 |
| Publisher Information: |
American Physical Society |
| Publication Year: |
2020 |
| Collection: |
DESY Publication Database (PUBDB) |
| Subject Terms: |
info:eu-repo/classification/ddc/530 |
| Subject Geographic: |
DE |
| 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 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
2331-7019; 2331-7043 |
| Relation: |
info:eu-repo/semantics/altIdentifier/issn/2331-7019; info:eu-repo/semantics/altIdentifier/wos/WOS:000575421300002; info:eu-repo/semantics/altIdentifier/issn/2331-7043 |
| Availability: |
https://bib-pubdb1.desy.de/record/454602; https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2021-00604%22 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.7687450 |
| Database: |
BASE |