Reflectivity enhancement in titanium by ultrafast XUV irradiation.
The study of highly photo-excited matter at solid state density is an emerging field of research, which is benefitting the development of free-electron-laser (FEL) technology. We report an extreme ultraviolet (XUV) reflectivity experiment from a titanium (Ti) sample irradiated with ultrafast seeded FEL pulses at variable incident photon fluence and frequency. Using a Drude formalism we relate the observed increase in reflectivity as a function of the excitation fluence to an increase in the plasma frequency, which allows us to estimate the free electron density in the excited sample. The extreme simplicity of the experimental setup makes the present approach potentially a valuable complementary tool to determine the average ionization state of the excited sample, information of primary relevance for understanding the physics of matter under extreme conditions.
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Bencivenga
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Principi
1] Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy [2] Dipartimento di Fisica, Università degli Studi di Trieste, 34127 Trieste, Italy.
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Giangrisostomi
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Cucini
1] Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy [2] Dipartimento di Fisica, Università degli Studi di Trieste, 34127 Trieste, Italy.
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Battistoni
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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D'Amico
Physics Division, School of Science and Technology, Università di Camerino, I-62032 Camerino (MC), Italy.
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Di Cicco
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Di Fonzo
Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, I-67100 L'Aquila, Italy.
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Filipponi
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Gessini
Physics Division, School of Science and Technology, Università di Camerino, I-62032 Camerino (MC), Italy.
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Gunnella
Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, FR-91405 Orsay, France.
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Marsi
Physics Division, School of Science and Technology, Università di Camerino, I-62032 Camerino (MC), Italy.
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Properzi
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Saito
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163, 5 in AREA Science Park, I-34149 Basovizza, Italy.
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Masciovecchio