Abstract
Ionization and fragmentation of the RNA base uracil (C4H4N2O2) by means of Cq+ ions(q = 1–6)has been studied for ion kinetic energies ranging from 2 to 120 keV. Whereas for Cq+(q = 1, 3, 4,5, 6) very similar fragmentation yields are observed which increase with the projectilevelocity v,C2+ ions not only induce a fundamentally different fragmentationpattern but also lead to a decrease of fragmentation with ion velocityv. Atlow velocities, even almost complete fragmentation is observed. Our findings canbe explained by differences in the electronic structures of the Cq+ ions as well as byemploying the electronic stopping model previously applied to ion–fullereneinteractions.
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