Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Biomolecules and Electron Transfer
MO 18.7: Vortrag
Freitag, 10. März 2017, 12:30–12:45, N 25
Momentum imaging of dissociative electron attachment in heterocyclic organic compounds — •Marvin Weyland1, Alexander Dorn1, Xueguang Ren1, Hans Rabus2, and Woon Yong Baek2 — 1Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Dissociative electron attachment (DEA) has been identified as a possible process for radiation damage. In short, DEA is a resonant two-step process in which first a low-energetic electron is captured by a molecule. The created negative ion can subsequently dissociate while the captured electron stays attached to one of the fragments. Detailed understanding of this reaction in biologically relevant molecules is crucial to improve its understanding. We investigated the heterocyclic organic compounds furan and pyridine as prototypes of typical organic molecules. Using a momentum imaging apparatus to detect the negative ions, we investigated the differential cross sections of several fragments after dissociation for each target molecule. From the resonance energy for formation of the fragment, combined with their kinetic energy and angular distributions, we can gain information about the dissociation process.
Our experimental results are compared to recent ab initio calculations with the goal to connect the dissociation process to specific electron scattering resonances in the target molecule.