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Modeling of Thermodiffusion Inertia in Metal Films Heated with Ultrashort Laser Pulses

100%

Janavičius A., Turskienė S.

Previously, we considered the analytical solution of nonlinear diffusion equation in two-dimensional surface. This allows us to consider the same nonlinear heat conduction equation for metals heated by a picosecond laser. After fast thermalization (within a few femtoseconds) of the laser energy and electron excitation in the conductivity band, electrons ballistically diffuse and transfer their energies to the target atoms and equilibrium electrons from the conductivity band. In this case, we have thermal diffusion of nonequilibrium excited electrons and thermal inertia for thermodiffusion. The relaxation time of excited conductivity electrons is directly connected with thermal inertia and depends on electron-electron collision frequencies. The theoretical temperature surface plots for the thermodiffusion of excited electrons were obtained from analytical solutions of nonlinear thermodiffusion equations.

Photoexcitation Spectroscopy and Material Alteration with Free-Electron Laser

70%

Sturmann J., Albridge R. G., Barnes A. V., Gilligan J., Graham M. T., Mckinley J. T., Ueda A., Wang W., Yang X., Tolk N. H., Davidson J. L., Margaritondo G.

Acta Physica Polonica A

1997

vol. 91

issue 4

689-696

As synchrotron radiation sources have been used for many experiments in the ultraviolet and X-ray regimes, the free-electron laser is an excellent source for a wide array of infrared-photon projects and applications. The free-electron laser delivers a beam of powerful tunable pulsed radiation which provides the opportunity for spatial and temporal localization of the energy delivered at any desired wavelength within the 2-10 μ regime. One application discussed employs the free-electron laser for spectroscopy as a probe of electronic and vibrational structures. Another application uses the free-electron laser beam as a tool for altering materials in a fundamentally new way.

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2 Acta Physica Polonica A

1 2006

1 1997

1 Albridge R. G.

1 Barnes A. V.

1 Davidson J. L.

1 Gilligan J.

1 Graham M. T.

1 Janavičius A.

1 Margaritondo G.

1 Mckinley J. T.

1 Sturmann J.

1 Tolk N. H.

1 Turskienė S.

1 Ueda A.

1 Wang W.

1 Yang X.

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Modeling of Thermodiffusion Inertia in Metal Films Heated with Ultrashort Laser Pulses

Photoexcitation Spectroscopy and Material Alteration with Free-Electron Laser