Theory for the ultrafast ablation of graphite films release_w3n5xzagi5eqzctmix23aa7ofa

by H. O. Jeschke, M. E. Garcia, K. H. Bennemann

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2001  

Abstract

The physical mechanisms for damage formation in graphite films induced by femtosecond laser pulses are analyzed using a microscopic electronic theory. We describe the nonequilibrium dynamics of electrons and lattice by performing molecular dynamics simulations on time-dependent potential energy surfaces. We show that graphite has the unique property of exhibiting two distinct laser induced structural instabilities. For high absorbed energies (> 3.3 eV/atom) we find nonequilibrium melting followed by fast evaporation. For low intensities above the damage threshold (> 2.0 eV/atom) ablation occurs via removal of intact graphite sheets.
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Date   2001-03-05
Version   v1
Language   en ?
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