Dissociative multi-photon ionization of isolated uracil and uracil-adenine complexes

Ryszka, M.; Pandey, R.; Rizk, C.; Tabet, J.; Barc, B.; Dampc, M.; Mason, N.J. and Eden, S. (2016). Dissociative multi-photon ionization of isolated uracil and uracil-adenine complexes. International Journal of Mass Spectrometry, 396 pp. 48–54.

DOI: https://doi.org/10.1016/j.ijms.2015.12.006

Abstract

Recent multi-photon ionization (MPI) experiments on uracil revealed a fragment ion at m/z 84 that was proposed as a potential marker for ring opening in the electronically excited neutral molecule. The present MPI measurements on deuterated uracil identify the fragment as C3H4N2O+ (uracil+ less CO), a plausible dissociative ionization product from the theoretically predicted open-ring isomer. Equivalent measurements on thymine do not reveal an analogous CO loss channel, suggesting greater stability of the excited DNA base. MPI and electron impact ionization experiments have been carried out on uracil-adenine clusters in order to better understand the radiation response of uracil within RNA. Evidence for C3H4N2O+ production from multi-photon-ionized uracil-adenine clusters is tentatively attributed to a significant population of π-stacked configurations in the neutral beam.

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About

  • Item ORO ID
  • 50513
  • Item Type
  • Journal Item
  • ISSN
  • 1387-3806
  • Project Funding Details
  • Funded Project NameProject IDFunding Body
    Not SetNot SetThe Open University
    Life Sciences Interface FellowshipEP/E039618/1EPSRC (Engineering and Physical Sciences Research Council)
    Career Acceleration FellowshipEP/J002577/1EPSRC (Engineering and Physical Sciences Research Council)
    Absolute clustering effects on electron attachment (SP-13-004-SE)EP/L002191/1EPSRC (Engineering and Physical Sciences Research Council)
    Marie Curie IntraEuropean Reintegration GrantMERG-CT-2007-207292European Commission
  • Keywords
  • Uracil; Adenine-uracil clusters; Fragmentation; Multi-photon ionization; Electron impact ionization; Mass spectrometry
  • Academic Unit or School
  • Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
    Faculty of Science, Technology, Engineering and Mathematics (STEM)
  • Research Group
  • Physics
  • Copyright Holders
  • © 2015 Elsevier
  • Depositing User
  • Sam Eden
CORE (COnnecting REpositories)

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