دورية أكاديمية
Amorphous to crystalline phase transition in carbon induced by intense femtosecond x-ray free-electron laser pulses
| العنوان: | Amorphous to crystalline phase transition in carbon induced by intense femtosecond x-ray free-electron laser pulses |
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| المؤلفون: | Gaudin, J., Peyrusse, O., Chalupský, J. (Jaromír), Toufarová, M. (Martina), Vyšín, L. (Luděk), Hájková, V. (Věra), Sobierajski, R., Burian, T. (Tomáš), Dastjani-Farahani, S., Graf, A., Amati, M., Gregoratti, L., Hau-Riege, S.P., Hoffmann, G., Juha, L. (Libor), Krzywinski, J., London, R.A., Moeller, S., Sinn, H., Schorb, S., Störmer, M., Tschentscher, T., Vorlíček, V. (Vladimír), Vu, H., Bozek, J., Bostedt, C. |
| سنة النشر: | 2012 |
| المجموعة: | The Czech Academy of Sciences: Publication Activity (ASEP) / Akademie věd ČR - Publikační činnost |
| مصطلحات موضوعية: | amorphous carbon, phase transition, graphitization, x-ray laser, free-electron laser |
| الوصف: | 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. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1098-0121 |
| العلاقة: | urn:pissn: 1098-0121; http://hdl.handle.net/11104/0212833Test |
| DOI: | 10.1103/PhysRevB.86.024103 |
| الإتاحة: | https://doi.org/10.1103/PhysRevB.86.024103Test http://hdl.handle.net/11104/0212833Test |
| رقم الانضمام: | edsbas.D9A8EE1D |
| قاعدة البيانات: | BASE |
| تدمد: | 10980121 |
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| DOI: | 10.1103/PhysRevB.86.024103 |