Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Photoionization II

A 8.3: Hauptvortrag

Montag, 14. März 2011, 17:30–18:00, BAR 106

Double Photoionization of Aromatic Hydrocarbons — •Ralf Wehlitz — SRC, UW-Madison, Stoughton, WI-53589, USA

Recently we have studied the double-ionization process in various aromatic hydrocarbons using synchrotron radiation. The double-to-single photoionization ratio was recorded over a large photon energy range in order to compare that ratio for different molecules and atoms. Questions that will be addressed in this talk are: How does the structure of a molecule affect the double photoionization process? Is there an isomer effect? And, how similar is the general photon-energy dependence of the ratio among different hydrocarbons?

Previous investigations on C60 [1] showed that the double-to-single photoionization ratio as a function of photon energy can be used to determine geometrical distances of the cluster such as the carbon-carbon distance. Although aromatic hydrocarbons (with benzene being the prototype molecule) do not have localized valence electrons as C60 has, we did find a similar effect that leads to an enhanced ratio based on the structure of the benzene ring.

The SRC is supported by US-NSF Grant No. DMR-0537588

[1] P.N. Juranic et al., Phys. Rev. Lett. 96, 023001 (2006)

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