Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 43: Biomolecules I
MO 43.4: Vortrag
Mittwoch, 15. März 2006, 14:45–15:00, H10
Inelastic electron interaction (ionization/attachment) of biomolecules embedded in superfluid He droplets — •Stephan Denifl1, Fabio Zappa1,2, Ingo Mähr1, Paul Scheier1, and Tilmann D. Märk1 — 1Institut für Ionenphysik, Leopold-Franzens Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria — 2UNESA, Rio de Janeiro, Brasil
Since the pioneering experiments by Sanche and coworkers [1] demonstrating that low energy electrons can damage plasmid DNA we have also started a series of measurements concerning inelastic electron interaction (ionization/attachment) with compounds of the DNA. First measurements were carried out with isolated biomolecules in the gas phase [2]. We extend now these measurements by embedding the biomolecules in helium droplets which leads to the formation of bio-molecular clusters. We study the behavior of these clusters upon ionization and electron attachment using a double focusing mass spectrometer and compare the results with those from isolated gas phase molecules.
This work was supported by FWF (Wien), the EU commission (Brussels, through the EPIC network and the COST Action P9). F.Z gratefully acknowledges a post-doc grant from Brazilian agency CNPq.
[1] B. Boudaiffa, P. Cloutier, D. Hunting, M. A. Huels and L. Sanche, Science 287 (2000) 1658
[2] S. Denifl, S.Ptasinska, M. Probst, J. Hrusak, P. Scheier and T.D. Märk, J. Phys. Chem. A 108 (2004) 6562-6569