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

B. Barc, M. Ryszka, J. C. Poully, E. Jabbour Al Maalouf, Z. El Otell, J. Tabet, R. Parajuli, P. J. M. Van Der Burgt, P. Limão-Vieira, P. Cahillane, M. Dampc, N. J. Mason, S. Eden

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)194-199
Number of pages6
JournalInternational Journal of Mass Spectrometry
Volume365-366
Issue numberSI
DOIs
Publication statusPublished - 15 May 2014

Keywords

  • Adenine
  • Cluster
  • Dissociative ionisation
  • Electron impact ionisation
  • Hypoxanthine
  • Multi-photon ionisation

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