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Classical over-the-barrier model for ionization of poly-cyclic aromatic hydrocarbons in keV-collisions with atomic ions
Stockholm University, Faculty of Science, Department of Physics. (Atomic Physics)
2011 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

We are developing a novel classical over-the barrier model for electron transfer from an in nitely thin conducting disc to a point charge projectile to model multiple electron capture in e.g. keV collisions of atomic ions with poly-cyclic aromatic hydrocarbons (PAHs). In its nal form, the present model will incorporate the polarization of the PAH molecules due to the active electron and the point charge projectile at a general angle of incidence. This will drastically improve the description of the potential barrier in comparisons with simpler versions of the model where the nite size and polarizability of the target molecule is neglected or treated in an averaged fashion. In this work we arrive at expressions for the electrostatic potential energy barrier experienced by the active electron in the two spatial orientations where the point charge projectile is located along the normal symmetry axis and in the tangent plane of the disc. Applied to coronene (C24H12) such barriers compare better with high level density functional theory (DFT) calculations than with the results from the simpler versions of the classical over-the-barrier models for atomic and spherical cluster targets. These results thus strongly supports the conducting disc approximation of PAHs. Finally we discuss the nal steps in the model development and possible extensions of the model to include less symmetric elliptical discs or spherical caps.

Place, publisher, year, edition, pages
2011. , 23 p.
Keyword [en]
PAH, collisions, ions, electrostatic, model, potential, barrier
Keyword [sv]
PAH, kollisioner, joner, elektrostatisk, modell, potential, barriär
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:su:diva-60168OAI: diva2:433686
Physics, Chemistry, Mathematics
Available from: 2011-08-22 Created: 2011-08-10 Last updated: 2011-08-22Bibliographically approved

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Forsberg, Björn
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