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Absolute cross section measurements of ions on coronene

Deuzeman, M.J. (2014) Absolute cross section measurements of ions on coronene. Master's Thesis / Essay, Physics.

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In this thesis, a method for obtaining absolute cross sections of interactions of ions with molecules, leading to loss of the molecules, is tested. The great asset of this method is that it can be used for molecules for which it is hard to produce a dense target, if possible at all. The method, in which a sufficiently dense target is accumulated in a trap, is tested by exposing coronene to several low charge state ion beams. Coronene belongs to the Polycyclic Aromatic Hydrocarbons (PAHs), a group of planar molecules that consist of multiple fused aromatic rings. PAHs are believed to be widely present in the Interstellar Medium (ISM) and therefore their stability, dynamics and interaction properties are of great interest in astrophysics. The coronene molecules are created by electrospray ionization and trapped in a Paul trap, where the coronene is exposed to an ion beam. The amount of coronene loss is related to the exposure to the ion beam; the cross section is determined by varying the irradiation time. The cross section could be determined for several ions with kinetic energies in the range of 2 to 25 keV/amu. There is no energy-dependence up to 20 keV/amu, but there is a charge state-dependence, which is in agreement with the theory.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:57
Last Modified: 15 Feb 2018 07:57

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