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Ions colliding with polycyclic aromatic hydrocarbon clusters
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2013 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T156, 014062- p.Article in journal (Refereed) Published
Abstract [en]

We have measured the ionization and fragmentation of polycyclic aromatic hydrocarbon (PAH) molecules and their clusters. We find that PAH clusters containing up to roughly 100 individual molecules fragment strongly following collisions with keV ions in low or high charge states (q). For both types of collisions, singly charged PAH molecules are found to be the dominant products but for very different reasons. A high-q ion projectile charge leads to strong multiple ionization of the PAH clusters and subsequent Coulomb explosions. A low-q ion projectile charge often leads to single ionization but stronger internal heating and long evaporation sequences with a singly charged PAH monomer as the end product. We have developed a Monte Carlo method for collision-induced heating of PAH clusters and present an evaporation model where the clusters cool slowly as most of the internal energies are stored in intramolecular vibrations and not in molecule-molecule vibrations.

Place, publisher, year, edition, pages
2013. Vol. T156, 014062- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-100403DOI: 10.1088/0031-8949/2013/T156/014062ISI: 000329022300063OAI: oai:DiVA.org:su-100403DiVA: diva2:692966
Conference
16th International Conference on the Physics of Highly Charged Ions (HCI), SEP 02-07, 2012, Heidelberg, GERMANY
Note

AuthorCount:20;

Available from: 2014-02-03 Created: 2014-02-03 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Collision Induced Fragmentation of Molecules and Molecular Clusters: Knockout Driven Reactions in Fullerenes and PAHs
Open this publication in new window or tab >>Collision Induced Fragmentation of Molecules and Molecular Clusters: Knockout Driven Reactions in Fullerenes and PAHs
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This licentiate thesis covers experimental and theoretical studies of the fragmentation and sub- sequent reactions of fullerenes or Polycyclic Aromatic Hydrocarbons (PAHs). I present results from experiments where atoms or ions collide with fullerenes, PAHs, or clusters of these mole- cules at energies from 100 eV up to tens of keV.

The results of these experiments are interpreted using quantum chemical calculations, mol- ecular dynamics simulations, and a stopping model that we have developed. With these models I show that different energy transfer processes dominate at different collision energies, from nuclear stopping in low energy (~ 100 eV) collisions to electronic stopping at higher energies (~ 10 keV). I particularly focus on non-statistical fragmentation induced by nuclear stopping which can lead to the formation of exotic new species such as the odd-numbered C119 fullerene- like molecule. 

Place, publisher, year, edition, pages
Stockholm University, 2014
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-103501 (URN)
Presentation
2014-06-13, FB53, Roslagstullbacken 21, Stockholm, 14:00 (English)
Opponent
Supervisors
Available from: 2014-07-01 Created: 2014-05-20 Last updated: 2014-07-01Bibliographically approved

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Gatchell, MichaelZettergren, HenningSeitz, FabianChen, TaoAlexander, John D.Stocket, Mark H.Schmidt, Henning T.Cederquist, Henrik
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