Long-lived nonthermal electron distribution in aluminum excited by femtosecond extreme ultraviolet radiation

Bisio, Francesco ; Principi, Emiliano ; Magnozzi, Michele ; Giangrisostomi, Erika ; Mincigrucci, Riccardo ; Pasquali, Luca ; Masciovecchio, Claudio ; Boscherini, Federico ; Canepa, Maurizio (2017) Long-lived nonthermal electron distribution in aluminum excited by femtosecond extreme ultraviolet radiation. Physical Review B 96, 081119(R) (2017), 96 (8). 081119-1-081119-5. ISSN 2469-9950
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Abstract

We report a time-resolved study of the relaxation dynamics of Al films excited by ultrashort intense free-electron laser (FEL) extreme ultraviolet pulses. The system response was measured through a pump-probe detection scheme, in which an intense FEL pulse tuned around the Al L2,3 edge (72.5 eV) acted as the pump, while a time-delayed ultrafast pulse probed the near-infrared (NIR) reflectivity of the Al film. Remarkably, following the intense FEL excitation, the reflectivity of the film exhibited no detectable variation for hundreds of femtoseconds. Following this latency time, sizable reflectivity changes were observed. Exploiting recent theoretical calculations of the EUV-excited electron dynamics [N. Medvedev et al., Phys. Rev. Lett. 107, 165003 (2011)], the delayed NIR-reflectivity evolution is interpreted invoking the formation of very-long-living nonthermal hot electron distributions in Al after exposure to EUV pulses. Our data represent the first evidence in the time domain of such an intriguing behavior.

Abstract
Document type
Article
Creators
CreatorsAffiliationORCID
Bisio, FrancescoCNR-SPIN, C.so Perrone 24, I-16152 Genova, Italy
Principi, EmilianoElettra-Sincrotrone Trieste S. C. p. A., Strada Statale 14, km 163.5, 34149 Basovizza, Italy
Magnozzi, MicheleDipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy
Giangrisostomi, ErikaElettra-Sincrotrone Trieste S. C. p. A., Strada Statale 14, km 163.5, 34149 Basovizza, Italy
Mincigrucci, RiccardoElettra-Sincrotrone Trieste S. C. p. A., Strada Statale 14, km 163.5, 34149 Basovizza, Italy
Pasquali, LucaDipartimento di Ingegneria “Enzo Ferrari,” Università di Modena e Reggio Emilia, Via Vivarelli 10, 41125 Modena, Italy
Masciovecchio, ClaudioElettra-Sincrotrone Trieste S. C. p. A., Strada Statale 14, km 163.5, 34149 Basovizza, Italy
Boscherini, FedericoDipartimento di Fisica e Astronomica, University of Bologna, Italy
Canepa, MaurizioDipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy
Keywords
free electron lasers
Subjects
ISSN
2469-9950
DOI
Deposit date
25 Jul 2018 09:30
Last modified
25 Jul 2018 09:30
Project name
NEWLI - NEW LIght on transient states in condensed matter by advanced photon - electron spectroscopies
Funding program
MIUR - PRIN 2015
URI

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