Length effects in VUV photofragmentation of protonated peptides

Olmo Gonzalez Magana, G. Reitsma, S. Bari, R. Hoekstra, Thomas Schlathölter

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Abstract

We have studied photoionization of protonated synthetic peptides YG(n)F (n = 0, 1, 3, 5, 10). Photon energies ranging from 8 to 30 eV were used. For YG(n)F peptides up to n = 5 small fragment ions related to the sidechains of the aromatic terminal amino acids Y and F dominate the fragmentation patterns. The associated yields scale with total photoabsorption cross section, demonstrating efficient hole migration towards the terminal amino acids upon photoionization of the peptide backbone. For n = 10 the side-chain loss channel is quenched and a series of large dications appear.

Original languageEnglish
Pages (from-to)4351-4354
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number13
DOIs
Publication statusPublished - 2012

Keywords

  • CHARGE MIGRATION
  • GAS-PHASE
  • AMINO-ACIDS
  • DISSOCIATION
  • PHOTOIONIZATION
  • MOLECULES
  • CATIONS
  • METHYL
  • IONS
  • UV

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