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
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.
Tipologia del documento
Articolo
Autori
Parole chiave
free electron lasers
Settori scientifico-disciplinari
ISSN
2469-9950
DOI
Data di deposito
25 Lug 2018 09:30
Ultima modifica
25 Lug 2018 09:30
Nome del Progetto
Programma di finanziamento
MIUR - PRIN 2015
URI
Altri metadati
Tipologia del documento
Articolo
Autori
Parole chiave
free electron lasers
Settori scientifico-disciplinari
ISSN
2469-9950
DOI
Data di deposito
25 Lug 2018 09:30
Ultima modifica
25 Lug 2018 09:30
Nome del Progetto
Programma di finanziamento
MIUR - PRIN 2015
URI
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Statistica sui download
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