Length effects in VUV photofragmentation of protonated peptides |
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Authors: | González-Magaña O Reitsma G Bari S Hoekstra R Schlathölter T |
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Affiliation: | KVI Atomic and Molecular Physics, University of Groningen, The Netherlands. |
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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. |
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