GUILLON, C.; LANGOT, Pierre; DEL FATTI, N.; VALLÉE, F.

doi:10.1088/1367-2630/5/1/313

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GUILLON, C.
Centre de physique moléculaire optique et hertzienne [CPMOH]

LANGOT, Pierre
Centre de physique moléculaire optique et hertzienne [CPMOH]

DEL FATTI, N.
Laboratoire de Spectrométrie Ionique et Moléculaire [LASIM]

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New Journal of Physics. 2003-02-04, vol. 5, p. 13.1

Institute of Physics: Open Access Journals

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Ultrafast energy exchanges of a non-Fermi electron gas with the lattice are investigated in silver clusters with sizes ranging from 4 to 26 nm using a femtosecond pump-probe technique. The results yield evidence for a cluster-size-dependent slowing down of the short-time energy losses of the electron gas when it is strongly athermal. A constant rate is eventually reached after a few hundred femtoseconds, consistent with the electron gas internal thermalization kinetics, this behaviour reflecting evolution from an individual to a collective electron-lattice type of coupling. The timescale of this transient regime is reduced in small nanoparticles, in agreement with speeding up of the electron-electron interactions with size reduction. The experimental results are in quantitative agreement with numerical simulations of the electron kinetics.< Réduire

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Nonequilibrium electron energy-loss kinetics in metal clusters

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