Femtosecond laser pulses have opened new frontiers for the study of ultrafast phase transitions and nonequilibrium states of matter. In this Letter, we report on structural dynamics in atomic clusters pumped with intense near-infrared (NIR) pulses into a nanoplasma state. Employing wide-angle scattering with intense femtosecond x-ray pulses from a free-electron laser source, we find that highly excited xenon nanoparticles retain their crystalline bulk structure and density in the inner core long after the driving NIR pulse. The observed emergence of structural disorder in the nanoplasma is consistent with a propagation from the surface to the inner core of the clusters.

Ultrafast Structural Dynamics of nanoparticles in Intense Laser Fields / T. Nishiyama, Y. Kumagai, A. Niozu, H. Fukuzawa, K. Motomura, M. Bucher, Y. Ito, T. Takanashi, K. Asa, Y. Sato, D. You, Y. Li, T. Ono, E. Kukk, C. Miron, L. Neagu, C. Callegari, M. Di Fraia, G. Rossi, D.E. Galli, T. Pincelli, A. Colombo, T. Kameshima, Y. Joti, T. Hatsui, S. Owada, T. Katayama, T. Togashi, K. Tono, M. Yabashi, K. Matsuda, C. Bostedt, K. Nagaya, K. Ueda. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 123:12(2019 Sep 16). [10.1103/PhysRevLett.123.123201]

Ultrafast Structural Dynamics of nanoparticles in Intense Laser Fields

G. Rossi;D.E. Galli;T. Pincelli;A. Colombo;
2019

Abstract

Femtosecond laser pulses have opened new frontiers for the study of ultrafast phase transitions and nonequilibrium states of matter. In this Letter, we report on structural dynamics in atomic clusters pumped with intense near-infrared (NIR) pulses into a nanoplasma state. Employing wide-angle scattering with intense femtosecond x-ray pulses from a free-electron laser source, we find that highly excited xenon nanoparticles retain their crystalline bulk structure and density in the inner core long after the driving NIR pulse. The observed emergence of structural disorder in the nanoplasma is consistent with a propagation from the surface to the inner core of the clusters.
femptosecond XFEL pulses, cluster dynamics
Settore FIS/03 - Fisica della Materia
Settore FIS/01 - Fisica Sperimentale
   NOXSS (X-ray Single Shots of Nano Objects) un approccio sperimentale e teorico integrato per la caratterizzazione strutturale di nano e micro oggetti (clusters, nanocristalli, biomolecole, virus, liposomi) utilizzando gli impulsi X ultrabrevi ed ultrabrillanti delle sorgenti free electron laser europee
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2012Z3N9R9_001
16-set-2019
ago-2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/672961
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