Multiple ionization and fragmentation of the DNA base thymine by interaction with Cq+ ions
KVI Atomic Physics, Rijksuniversiteit Groningen, Zernikelaan 25, 9747AA Groningen, The Netherlands
Corresponding author: a tschlat@KVI.nl
Published online: 3 July 2003
Ionization and fragmentation of the DNA base thymine upon interaction with keV Cq+ ions () has been studied. By means of time-of-flight spectrometry of two or more thymine fragments in coincidence with an ejected electron we could investigate particular dissociation channels by means of their associated kinetic–energy–release. The fragmentation dynamics are strongly influenced by the Cq+ charge state: for low q values mainly fragmentation due to direct collisions is observed. With increasing q, electron capture becomes more important. For larger q we could identify several Coulomb explosion channels, leading to very energetic fragments.
PACS: 33.15.Ta – Mass spectra / 34.50.Gb – Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 61.80.Jh – Ion radiation effects / 82.39.Pj – Nucleic acids, DNA and RNA bases / 82.80.Rt – Time of flight mass spectrometry
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003