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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 ,
L.D. PIETANZA ,
F.A. TASSIELLI  and
M. CAPITELLI
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
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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.

Keywords

Boltzmann equationElectron relaxationNonequilibrium electron energy distribution functionSubpicosecond laser irradiationTwo-temperature model
Type
Research Article
Information
Laser and Particle Beams , Volume 20 , Issue 2 , April 2002 , pp. 285 - 290
Copyright
© 2002 Cambridge University Press

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