Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5361639 | Applied Surface Science | 2009 | 5 Pages |
Abstract
The theory and experiments concerned with the electron-ion thermal relaxation and melting of overheated crystal lattice constitute the subject of this paper. The physical model includes two-temperature (2T) equation of state, many-body interatomic potential, the electron-ion energy exchange, electron thermal conductivity, and optical properties of solid, liquid, and two phase solid-liquid mixture. Two-temperature hydrodynamics and molecular dynamics codes are used. An experimental setup with pump-probe technique is used to follow evolution of an irradiated target with a short time step 100Â fs between the probe femtosecond laser pulses. Accuracy of measurements of reflection coefficient and phase of reflected probe light are 1% and â¼1Â nm, respectively. It is found that, firstly, the electron-electron collisions make a minor contribution to a light absorption in solid Al at moderate intensities; secondly, the phase shift of a reflected probe results from heating of ion subsystem and kinetics of melting of Al crystal during 0ps
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Authors
N.A. Inogamov, V.V. Zhakhovskii, S.I. Ashitkov, V.A. Khokhlov, Yu.V. Petrov, P.S. Komarov, M.B. Agranat, S.I. Anisimov, K. Nishihara,