Thermodynamic and quantum statistic kinetic studies of electron-phonon relaxation by ablation of metals

Mauro Satta; David R. Ermer; Michael R. Papantonakis; Chiari Flamini; Richard F. Haglund Jr.; Anna Giardini-Guidoni; Aldo Mele

doi:10.1117/12.378184

25 February 2000 Thermodynamic and quantum statistic kinetic studies of electron-phonon relaxation by ablation of metals

Mauro Satta, David R. Ermer, Michael R. Papantonakis, Chiari Flamini, Richard F. Haglund Jr., Anna Giardini-Guidoni, Aldo Mele

Author Affiliations +

Proceedings Volume 4070, ALT '99 International Conference on Advanced Laser Technologies; (2000) https://doi.org/10.1117/12.378184
Event: ALT'99 International Conference: Advanced Laser Technologies, 1999, Potenza-Lecce, Italy

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 T_e and the lattice temperature T_i 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.

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Mauro Satta, David R. Ermer, Michael R. Papantonakis, Chiari Flamini, Richard F. Haglund Jr., Anna Giardini-Guidoni, and Aldo Mele "Thermodynamic and quantum statistic kinetic studies of electron-phonon relaxation by ablation of metals", Proc. SPIE 4070, ALT '99 International Conference on Advanced Laser Technologies, (25 February 2000); https://doi.org/10.1117/12.378184

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