Hannover 2003 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS VI: HV VI
MS VI.1: Hauptvortrag
Donnerstag, 27. März 2003, 12:00–12:30, F 428
Wechselwirkung von Elektronen und Protonen mit biologisch relevanten Molekülen, Untersucht mittels hochauflösender Massenspektrometrie — •Paul Scheier1, Gernot Hanel1, Stephan Denifl1, Bettina Gstir1, Aleksandar Stamatovic1, Stefan Matejcik1,2, Tilmann Märk1,2, Bruno Coupier1,3, Bernadette Farizon3, Michel Carre3, and Michel Farizon3 — 1Institut für Ionenphysik, A-6020 Innsbruck — 2Department of Plasma Physics, Sk-84215 Bratislava — 3Institut de Physique Nucleaire, F-69622 Villeurbanne Cedex
The formation of both positively and negatively charged ions has been investigated for the collision of highly monochromatized electrons with molecules such as uracil, thymine, cytosine and chlorouracil. These molecules were chosen to investigate and understand the basic processes that lead to the damage of living cells upon exposure to ionizing radiation. Dissociative electron attachment to all DNA and RNA bases reveals an unexpectedly high cross section at electron energies below 2 eV. Ionization threshold studies give additional information on the electron induced dissociation of these molecules. Parallel the ionization of these molecules by protons was investigated in the energy range between 20 and 150keV.
Work partially supported by FWF, ÖNB and ÖAW, Wien, Austria and European Commission, Brussels.