Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 5: Posters 1: Novelties in Molecular Physics
MO 5.12: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Dipole-driven dynamics for near threshold electron/positron interactions with DNA/RNA bases — •Fabio Carelli1, Jan Franz2, and Franco A. Gianturco1,3 — 1Institute for Ion Physics and Applied Physics, Innsbruck University, 6020 Innsbruck, Austria — 2Department of Atomic, Molecular and Optical Physics, University of Technology, 80-233 Gdansk, Poland — 3Scuola Normale Superiore, 56125 Pisa, Italy
It is well known that when an external ionizing radiation interacts with living organisms, one of the mechanisms responsible for genetic damage involves metastable attachment of secondary low-energy electrons to DNA/RNA bases, while the interactions of low-energy positrons in molecular biological gases or in condensed media has found a wide-spread range of applications (for example the role of positronium formation/annihilation probabilities in different environments).
For all the above processes, the knowledge of the paths by which the impinging lepton attaches biomolecules is crucial.
We know that for gas-phase rotating polar molecules with supercritical dipoles a finite number of Rydberg-like states involving e− exists (and for e+ could exist, being mainly differentiated by the spatial orientation).
The interaction dynamics of DNA/RNA bases (all having large permanent dipoles) with near-threshold collisions involving e−/e+ shall be presented and discussed: the aim is suggesting a new formation/stabilization mechanism for charged biomolecules occurring through a more ’gentle’ energy release path.