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Nonequilibrium electron energy distribution in Au under subpicosecond laser irradiation: A kinetic study

Published online by Cambridge University Press:  13 November 2002

S. LONGO
Affiliation:
IMIP-CNR (Section of Bari) and Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy
L.D. PIETANZA
Affiliation:
IMIP-CNR (Section of Bari) and Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy
F.A. TASSIELLI
Affiliation:
IMIP-CNR (Section of Bari) and Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy
M. CAPITELLI
Affiliation:
IMIP-CNR (Section of Bari) and Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy

Abstract

We have performed a kinetic study of the electron dynamic relaxation inside a Au film subjected to a subpicosecond laser pulse. For this purpose, we have developed a time-dependent numerical solution of the Boltzmann equation for the electrons inside the film considering the collision integrals due to electron–electron and electron–phonon collisions and a perturbation term due to the laser pulse. Our results show that, after the pulse excitation, electron distributions are very far from equilibrium. Therefore it is not possible, especially in the first part of the temporal evolution, to describe the relaxation of the electron distribution through a two-temperature model.

Type
Research Article
Copyright
© 2002 Cambridge University Press

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