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Ejection-ionization of molecules from free standing graphene
Department of Chemistry, Texas A&M University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
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Number of Authors: 6
2017 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 146, no 8, 084308Article in journal (Refereed) Published
Abstract [en]

We present the first data on emission of C60stimulated by single impacts of 50 keV C602+on the self-assembled molecular layer of C60deposited on free standing 2 layer graphene. The yield,Y, of C60emitted in the transmission direction is 1.7%. To characterize the ejection and ionization of molecules,we have measured the emission of C60from the surface of bulk C60(Y= 3.7%) and from a singlelayer of C60deposited on bulk pyrolytic graphite (Y= 3.3%). To gain insight into the mechanism(s) ofejection, molecular dynamic simulations were performed. The scenario of the energy deposition andejection of molecules is different for the case of graphene due to the confined volume of projectile-analyte interaction. In the case of 50 keV C602+impacts on graphene plus C60, the C atoms of theprojectile collide with those of the target. The knocked-on atoms take on a part of the kinetic energyof the projectile atoms. Another part of the kinetic energy is deposited into the rim around the impactsite. The ejection of molecules from the rim is a result of collective movement of the molecules andgraphene membrane, where the membrane movement provides the impulse for ejection. The efficientemission of the intact molecular ions implies an effective ionization probability of intact C60. Theproposed mechanism of ionization involves the tunneling of electrons from the vibrationally exitedarea around the hole to the ejecta

Place, publisher, year, edition, pages
2017. Vol. 146, no 8, 084308
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Other Physics Topics
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Applied Physics
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URN: urn:nbn:se:ltu:diva-62204DOI: 10.1063/1.4976832ISI: 000395901000028PubMedID: 28249462Scopus ID: 2-s2.0-85013885928OAI: oai:DiVA.org:ltu-62204DiVA: diva2:1077606
Note

Validerad; 2017; Nivå 2; 2017-03-08 (andbra)

Available from: 2017-02-28 Created: 2017-02-28 Last updated: 2017-04-10Bibliographically approved

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CiteExportLink to record
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