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Volumn 74, Issue 22, 2006, Pages

Optimized energy coupling at ultrafast laser-irradiated metal surfaces by tailoring intensity envelopes: Consequences for material removal from Al samples

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EID: 33845663633     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.74.224106     Document Type: Article
Times cited : (70)

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    • This behavior can be attributed to the electron-ion energy relaxation occurring during the expansion of the hot electron gas. The electron-phonon coupling constant depends strongly on the electronic structure and its value is known with low accuracy at standard conditions. The linear dependence with the difference in the electron and the ion temperature is supposed to be valid for a weak variation at solid density. For lower densities, the plasma model should be applied but the extension of this model to high densities is not self-consistent with the solid model and leads to an overestimation of the coupling coefficient [see, e.g., PLEEE8 1063-651X 10.1103/PhysRevE.51.R5208
    • This behavior can be attributed to the electron-ion energy relaxation occurring during the expansion of the hot electron gas. The electron-phonon coupling constant depends strongly on the electronic structure and its value is known with low accuracy at standard conditions. The linear dependence with the difference in the electron and the ion temperature is supposed to be valid for a weak variation at solid density. For lower densities, the plasma model should be applied but the extension of this model to high densities is not self-consistent with the solid model and leads to an overestimation of the coupling coefficient [see, e.g., A. Ng, A. Forsman, and P. Celliers, Phys. Rev. E PLEEE8 1063-651X 10.1103/PhysRevE.51.R5208 51, R5208 (1995)]. To avoid increasing the complexity in our simulations, the electron-phonon coupling constant is left as a parameter with a constant value. If this assumption is acceptable during the quasi-isochoric heating, its accuracy may be doubtful during gas expansion (when insulating phases may appear). This fact is responsible for thermodynamic paths where the maximum temperature is reached at a density lower than the one corresponding to the critical point. However, this uncertainty on the thermalization time concerns few cells, as the external one at 0.25 nm in Figs. 10 11, and we suppose that the global thermodynamic behavior of the material is reasonable.
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