Femtosecond phase-transition in hard x-ray excited bismuth
| العنوان: | Femtosecond phase-transition in hard x-ray excited bismuth |
|---|---|
| المؤلفون: | Makita, M., Vartiainen, I., Mohacsi, I., Caleman, C., Diaz, A., Jönsson, H. O., Juranić, P., Medvedev, N., Meents, A., Mozzanica, A., Opara, N. L., Padeste, C., Panneels, V., Saxena, V., Sikorski, M., Song, S., Vera, L., Willmott, P. R., Beaud, P., Milne, C. J., Ziaja-Motyka, B., David, C. |
| بيانات النشر: | Deutsches Elektronen-Synchrotron, DESY, Hamburg |
| مصطلحات موضوعية: | 3. Good health |
| الوصف: | Scientific reports 9(1), 602 (2019). doi:10.1038/s41598-018-36216-3 The evolution of bismuth crystal structure upon excitation of its $A_{1g}$ phonon has been intensely studied with short pulse optical lasers. Here we present the first-time observation of a hard x-ray induced ultrafast phase transition in a bismuth single crystal at high intensities $(~10^{14} W/cm^2 ).$ The lattice evolution was followed using a recently demonstrated x-ray single-shot probing setup. The time evolution of the (111) Bragg peak intensity showed strong dependence on the excitation fluence. After exposure to a sufficiently intense x-ray pulse, the peak intensity dropped to zero within 300 fs, i.e. faster than one oscillation period of the $A_{1g}$ mode at room temperature. Our analysis indicates a nonthermal origin of a lattice disordering process, and excludes interpretations based on electron-ion equilibration process, or on thermodynamic heating process leading to plasma formation. Published by Springer Nature, Cham |
| اللغة: | English |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::23a5f24217c73fadd34d522e79290fbaTest |
| رقم الانضمام: | edsair.doi...........23a5f24217c73fadd34d522e79290fba |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |