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 projectile velocity v, C2+ ions not only induce a fundamentally different fragmentation pattern but also lead to a decrease of fragmentation with ion velocity v. At low velocities, even almost complete fragmentation is observed. Our findings can be explained by differences in the electronic structures of the Cq+ ions as well as by employing the electronic stopping model previously applied to ion-fullerene interactions.
|Article number||PII S0953-4075(02)38596-1|
|Number of pages||9|
|Journal||Journal of Physics B: Atomic, Molecular and Optical Physics|
|Publication status||Published - 14-Nov-2002|
- SLOW COLLISIONS
- CHARGED IONS