Correlation6

Correlation6 - Example: Au film irradiated by a 200 fs...

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University of Virginia, MSE 4270/6270: Introduction to Atomistic Simulations, Leonid Zhigilei Example: Au film irradiated by a 200 fs laser pulse at 18 mJ/cm 2 Three stages in the evolution of the diffraction profiles Time (ps) Normalized Peak Height 0 2 4 6 8 10 12 14 0 0.2 0.4 0.6 0.8 1 (1 1 1) (2 2 0) (3 1 1) Lattice temperature (K) 1338 300 505 746 964 1137 1262 1327 homogeneous melting uniaxial lattice deformation uniform lattice heating (1) 0 to 4 ps: thermal vibrations of atoms (Debye-Waller factor) (2) 4 to 10 ps: Debye-Waller + uniaxial lattice expansion (3) 10 to 14 ps: homogeneous melting Phys. Rev. B 73 , 184113 2006
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University of Virginia, MSE 4270/6270: Introduction to Atomistic Simulations, Leonid Zhigilei Example for melting of a nanocrystalline Au film (a) 0 ps (f) 500 ps Evolution of diffraction profiles can be related to time-resolved pump- probe experiments, with connections made to the microstructure of the target. (b) 20 ps (e) 200 ps (c) 50 ps (d) 150 ps calculations by Zhibin Lin, UVa
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University of Virginia, MSE 4270/6270: Introduction to Atomistic Simulations, Leonid Zhigilei Example for a complex material (e.g. solid C
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Correlation6 - Example: Au film irradiated by a 200 fs...

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