Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 5: Posters 1: Novelties in Molecular Physics
MO 5.11: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Dissociative electron attachment in biologically relevant molecules — •Marvin Weyland1,2, Alexander Dorn2, Hans Rabus1, Xueguang Ren1,2, Thomas Pflüger1,2, and Woon Yong Baek1 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany
Dissociative electron attachment (DEA) is presumed to be a large contributor to radiation damage in biological tissue and, therefore, has gained increased attention during the last decade. We set up a COLTRIMS-type instrument, adapted for negative ion detection to measure emission angles and energies of anions created in DEA-processes. Using a photoemission electron source we reach an impact energy resolution of 200 meV at about 1 µA peak current, thereby improving energy resolution compared to previous setups. First experiments have been performed with ammonia, investigating DEA in the monomer and small clusters. Advancing towards biologically relevant molecules we investigated furan. This liquid target is introduced using a seeded supersonic gas jet. We studied several fragmentation products at the DEA resonance around 6 eV electron impact energy, which should allow a more detailed understanding of the attachment process.