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, Phys. Rev. Lett. 107, 165003 (2011)PRLTAO0031-900710.1103/PhysRevLett.107.165003], the delayed NIR-reflectivity evolution is interpreted invoking the formation of very-long-living nonthermal hot electron distributions in Al after exposure to intense EUV pulses. Our data represent the first evidence in the time domain of such an intriguing behavior.

Long-lived nonthermal electron distribution in aluminum excited by femtosecond extreme ultraviolet radiation / Bisio, Francesco; Principi, Emiliano; Magnozzi, Michele; Simoncig, Alberto; Giangrisostomi, Erika; Mincigrucci, Riccardo; Pasquali, Luca; Masciovecchio, Claudio; Boscherini, Federico; Canepa, Maurizio. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - STAMPA. - 96:8(2017), pp. 081119.1-081119.5. [10.1103/PhysRevB.96.081119]

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

BOSCHERINI, FEDERICO;
2017

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, Phys. Rev. Lett. 107, 165003 (2011)PRLTAO0031-900710.1103/PhysRevLett.107.165003], the delayed NIR-reflectivity evolution is interpreted invoking the formation of very-long-living nonthermal hot electron distributions in Al after exposure to intense EUV pulses. Our data represent the first evidence in the time domain of such an intriguing behavior.
2017
Long-lived nonthermal electron distribution in aluminum excited by femtosecond extreme ultraviolet radiation / Bisio, Francesco; Principi, Emiliano; Magnozzi, Michele; Simoncig, Alberto; Giangrisostomi, Erika; Mincigrucci, Riccardo; Pasquali, Luca; Masciovecchio, Claudio; Boscherini, Federico; Canepa, Maurizio. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - STAMPA. - 96:8(2017), pp. 081119.1-081119.5. [10.1103/PhysRevB.96.081119]
Bisio, Francesco; Principi, Emiliano; Magnozzi, Michele; Simoncig, Alberto; Giangrisostomi, Erika; Mincigrucci, Riccardo; Pasquali, Luca; Masciovecchio, Claudio; Boscherini, Federico; Canepa, Maurizio
File in questo prodotto:
File Dimensione Formato  
Al-FERMI-PRB-2017.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per accesso libero gratuito
Dimensione 261.45 kB
Formato Adobe PDF
261.45 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/609702
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 12
social impact