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Multi-photon and electron impact ionisation studies of reactivity in adenine–water clusters

Authors
  • Barc, B.
  • Ryszka, M.
  • Poully, J.-C.
  • Jabbour Al Maalouf, E.
  • el Otell, Z.
  • Tabet, J.
  • Parajuli, R.
  • van der Burgt, P.J.M.
  • Limão-Vieira, P.
  • Cahillane, P.
  • Dampc, M.
  • Mason, N.J.
  • Eden, S.1, 2, 3, 4, 5, 6
  • 1 Department of Physical Sciences, The Open University
  • 2 CIMAP/GANIL
  • 3 Department of Physics, Faculty of Sciences II, Lebanese University
  • 4 Department of Physics, Amrit Campus, Tribhuvan University
  • 5 Department of Experimental Physics, National University of Ireland Maynooth
  • 6 Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia – Universidade Nova de Lisboa
Type
Published Article
Journal
International Journal of Mass Spectrometry
Publisher
Elsevier BV
Publication Date
Jan 01, 2014
Accepted Date
Jan 15, 2014
Identifiers
DOI: 10.1016/j.ijms.2014.01.007
Source
Elsevier
Keywords
License
Unknown

Abstract

Multi-photon ionisation (MPI) and electron impact ionisation (EII) mass spectrometry experiments have been carried out to probe unimolecular and intermolecular reactivities in hydrated adenine clusters. The effects of clustering with water on fragment ion production from adenine have been studied for the first time. While the observation of NH4+ fragments indicated the dissociation of protonated adenine, the dominant hydration effects were enhanced C4H4N4+ production and the suppression of dissociative ionisation pathways with high activation energies. These observations can be attributed to energy removal from the excited adenine radical cation via cluster dissociation. Comparisons of MPI and EII measurements provided the first experimental evidence supporting hypoxanthine formation in adenine–water clusters via theoretically predicted barrierless deamination reactions in closed shell complexes.

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