Molecular dynamics simulation study of the fluence dependence of particle yield and plume composition in laser desorption and ablation of organic solids

Leonid V. Zhigilei, Barbara J. Garrison

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104 Scopus citations

Abstract

Two distinct regimes of molecular ejection separated by a well-defined threshold fluence are observed in molecular dynamics simulation of pulsed laser irradiation of an organic solid. At fluences above the threshold a collective multilayer ejection or ablation occurs where large liquid droplets are ejected and the total yield of the ablated material follows a critical volume density of the deposited energy. Below threshold thermal desorption from the surface is observed and the desorption yield has an Arrhenius-type dependence on the laser fluence. The yield of monomers does not have a step increase at the threshold and thus deceptively does not give a straightforward interpretation of the ejection mechanisms.

Original languageEnglish (US)
Pages (from-to)1341-1343
Number of pages3
JournalApplied Physics Letters
Volume74
Issue number9
DOIs
StatePublished - Mar 1 1999

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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