Non-statistical fragmentation in photo-activated flavin mononucleotide anions

Linda Giacomozzi, Christina Kjær, Steen Brøndsted Nielsen, Eleanor K. Ashworth, James N. Bull, Mark H. Stockett

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The spectroscopy and photo-induced dissociation of flavin mononucleotide anions in vacuo are investigated over the 300-500 nm wavelength range. Comparison of the dependence of fragment ion yields as a function of deposited photon energy with calculated dissociation energies and collision-induced dissociation measurements performed under single-collision conditions suggests that a substantial fraction of photo-activated ions decompose through non-statistical fragmentation pathways. Among these pathways is the dominant photo-induced fragmentation channel, the loss of a fragment identified as formylmethylflavin. The fragment ion specific action spectra reveal electronic transition energies close to those for flavins in solution and previously published gas-phase measurements, although the photo-fragment yield upon excitation of the S 2 ← S 0 transition appears to be suppressed.

Original languageEnglish
Article number044305
JournalThe Journal of Chemical Physics
Issue number4
Publication statusPublished - 26 Jul 2021

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