Fragmentation pathways of diphenyl ether radical cations

M. Guerra, M. H. Cabral, A. C. S. Paiva

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The fragmentation pattern of diphenyl ether (DPE) for both non-resonant and resonant multiphotoionization conditions was obtained. The competition between the processes leading to mass-to-charge ratios m/z 142 and m/z 77 was analyzed. The appearance energies, obtained in this work for the rearrangement and cleavage fragmentation channels, are found to be in relative agreement with the generally accepted values of 12.69 eV and 14.88 eV, respectively. In fact, the agreement is only obtained for values of the ionization energy (IE) somewhat higher than the NIST reference value. The lack of a reliable IE value hinders the possibility to better pinpoint the appearance energies for all channels involved. From these studies we may say that, with the intensities and duration of the laser pulses used, the ladder switching mechanism does not always apply.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalInternational Journal of Mass Spectrometry
Publication statusPublished - 15 Dec 2015


  • Appearance potentials
  • Diphenyl ether
  • Fourier-transform ion-cyclotron-resonance
  • Resonant enhanced multiphotoionization


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