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Proceedings Paper

Thermodynamic and quantum statistic kinetic studies of electron-phonon relaxation by ablation of metals
Author(s): Mauro Satta; David R. Ermer; Michael R. Papantonakis; Chiari Flamini; Richard F. Haglund; Anna Giardini-Guidoni; Aldo Mele
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Paper Abstract

Electron-phonon relaxation in metals following ultrashort- pulse optical excitation has been studied both in thin films and bulk metals by a number of investigators. Here we report recent experiments on ion emission from several different metals using a free-electron laser which delivers a train of subpicosecond micropulses in the mid-IR. The threshold intensities for the damage threshold together with the ion emission are used as markers for the onset of energy transfer to the lattice for ablation. Numerical calculations based on the Anisimov two-temperature model are used to evaluate the electron temperature Te and the lattice temperature Ti from the incident fluence at the damage threshold and the ion-emission. The result will be discussed in terms of the Hertz-Knudsen equation for vaporization and of a model based on laser induced multiple electronic transitions.

Paper Details

Date Published: 25 February 2000
PDF: 7 pages
Proc. SPIE 4070, ALT '99 International Conference on Advanced Laser Technologies, (25 February 2000); doi: 10.1117/12.378184
Show Author Affiliations
Mauro Satta, Univ. degli Studi di Roma La Sapienza (Italy)
David R. Ermer, Vanderbilt Univ. (United States)
Michael R. Papantonakis, Vanderbilt Univ. (United States)
Chiari Flamini, Univ. degli Studi di Roma La Sapienza (Italy)
Richard F. Haglund, Vanderbilt Univ. (United States)
Anna Giardini-Guidoni, Univ. degli Studi di Roma La Sapienza (Italy)
Aldo Mele, Univ. degli Studi di Roma La Sapienza (Italy)

Published in SPIE Proceedings Vol. 4070:
ALT '99 International Conference on Advanced Laser Technologies
Vladimir I. Pustovoy; Vitali I. Konov, Editor(s)

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