Fluid flow and effusive desorption: Dominant mechanisms of energy dissipation after energetic cluster bombardment of molecular solids

Daniel A. Brenes, Barbara J. Garrison, Nicholas Winograd, Zbigniew Postawa, Andreas Wucher, Paul Blenkinsopp

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The angular distribution of intact organic molecules desorbed by energetic C60 primary ions was probed both experimentally and with molecular dynamics computer simulations. For benzo[a]pyrene, the angular distribution of intact molecules is observed to peak at off-normal angles. Molecular dynamics computer simulations on a similar system show the mechanism of desorption involves fast deposition of energy followed by fluid-flow and effusive-type emission of intact molecules. The off-normal peak in the angular distribution is shown to arise from emission of intact molecules from the rim of a crater formed during the cluster impact. This signature is unique for molecules because fragmentation processes remove molecules that would otherwise eject at directions near-normal to the surface.

Original languageEnglish (US)
Pages (from-to)2009-2014
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume2
Issue number16
DOIs
StatePublished - Aug 18 2011

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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