Role of the ionization potential in nonequilibrium metals driven to absorption saturation.
A composite metallic foil (Al/Mg/Al) has been exposed to intense sub-100 fs free electron laser (FEL) pulses and driven to ultrafast massive photoionization. The resulting nonequilibrium state of matter has been monitored through absorption spectroscopy across the L(2,3) edge of Mg as a function of the FEL fluence. The raw spectroscopic data indicate that at about 100J/cm(2) the main absorption channels of the sample, i.e., Mg (2p→free) and oxidized Al (valence→free), are almost saturated. The spectral behavior of the induced transparency has been interpreted with an analytical approach based on an effective ionization potential of the generated solid-density plasma.
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.|Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via A. Pascoli, 06123 Perugia, Italy.
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Mincigrucci
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Bencivenga
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Capotondi
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Principi
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.|Dipartimento di Fisica, Università degli Studi di Trieste, via A. Valerio 2, 34127 Trieste, Italy.
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Giangrisostomi
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.|Dipartimento di Fisica, Università degli Studi di Trieste, via A. Valerio 2, 34127 Trieste, Italy.
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Battistoni
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Caputo
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Casolari
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Gessini
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Manfredda
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Pedersoli
Elettra-Sincrotrone Trieste, SS 14-km 163.5, 34149 Basovizza, Trieste, Italy.
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Masciovecchio