Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 16, Pages 2009-2014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz200708j
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Funding
- National Institute of Health [2R01 EB002016-18]
- National Science Foundation [CHE-0908226, CHE-0910564]
- Department of Energy [DE-FG02-06ER15803]
- Polish Ministry of Science and Higher Education [N N204 183940]
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The angular distribution of intact organic molecules desorbed by energetic C-60 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.
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