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Amorphous to crystalline phase transition in carbon induced by intense femtosecond x-ray free-electron laser pulses
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SYSNO ASEP 0382680 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Amorphous to crystalline phase transition in carbon induced by intense femtosecond x-ray free-electron laser pulses Author(s) Gaudin, J. (DE)
Peyrusse, O. (FR)
Chalupský, Jaromír (FZU-D) RID, ORCID
Toufarová, Martina (FZU-D) RID
Vyšín, Luděk (FZU-D) RID, ORCID
Hájková, Věra (FZU-D) RID, ORCID
Sobierajski, R. (PL)
Burian, Tomáš (FZU-D) RID, ORCID
Dastjani-Farahani, S. (DE)
Graf, A. (US)
Amati, M. (IT)
Gregoratti, L. (IT)
Hau-Riege, S.P. (US)
Hoffmann, G. (DE)
Juha, Libor (FZU-D) RID, ORCID, SAI
Krzywinski, J. (DE)
London, R.A. (US)
Moeller, S. (DE)
Sinn, H. (DE)
Schorb, S. (DE)
Störmer, M. (DE)
Tschentscher, T. (DE)
Vorlíček, Vladimír (FZU-D) RID
Vu, H. (DE)
Bozek, J. (US)
Bostedt, C. (US)Source Title Physical Review B - ISSN 1098-0121
Roč. 86, č. 2 (2012), "024103-1"-"024103-7"Number of pages 7 s. Language eng - English Country US - United States Keywords amorphous carbon ; phase transition ; graphitization ; x-ray laser ; free-electron laser Subject RIV BH - Optics, Masers, Lasers R&D Projects GAP108/11/1312 GA ČR - Czech Science Foundation (CSF) GAP205/11/0571 GA ČR - Czech Science Foundation (CSF) GAP208/10/2302 GA ČR - Czech Science Foundation (CSF) IAAX00100903 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) EE.2.3.20.0087 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100523 - FZU-D (2005-2011) UT WOS 000306309300001 DOI https://doi.org/10.1103/PhysRevB.86.024103 Annotation We present the results of an experiment where amorphous carbon undergoes a phase transition induced by femtosecond 830 eV x-ray free-electron laser pulses. The phase transition threshold fluence is found to be 282 ± 11 mJ/cm2. Atomic force microscopy, photoelectron microscopy, and micro-Raman spectroscopy give experimental evidence for the phase transition in terms of a volume expansion, graphitization, and change of local order of the irradiated sample area. The interaction is modeled by an accurate time-dependent treatment of the ionization dynamics coupled to a two-temperature model. At the phase transition fluence threshold the free-electron density Ne is found to be at maximum 9 × 1020 cm-3 while the ion (atom) temperature is found to be 1050 K, e.g., above the crystallization activation temperature reported in the literature. This low ionization rate and high atom temperature suggest a thermally activated phase transition. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2013
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