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 language | English (US) |
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Pages (from-to) | 1341-1343 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 74 |
Issue number | 9 |
DOIs | |
State | Published - Mar 1 1999 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)