Photodissociation of protonated leucine-enkephalin in the VUV range of 8-40 eV

S. Bari*, O. Gonzalez-Magana, G. Reitsma, J. Werner, S. Schippers, R. Hoekstra, T. A. Schlathölter

*Corresponding author for this work

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    Abstract

    Until now, photodissociation studies on free complex protonated peptides were limited to the UV wavelength range accessible by intense lasers. We have studied photodissociation of gas-phase protonated leucine-enkephalin cations for vacuum ultraviolet (VUV) photons energies ranging from 8 to 40 eV. We report time-of-flight mass spectra of the photofragments and various photofragment-yields as a function of photon energy. For sub-ionization energies our results are in line with existing studies on UV photodissociation of leucine-enkephalin. For photon energies exceeding 10 eV we could identify a new dissociation scheme in which photoabsorption leads to a fast loss of the tyrosine side chain. This loss process leads to the formation of a residual peptide that is remarkably cold internally. (C) 2011 American Institute of Physics. [doi:10.1063/1.3515301]

    Original languageEnglish
    Article number024314
    Pages (from-to)024314
    Number of pages9
    JournalJournal of Chemical Physics
    Volume134
    Issue number2
    DOIs
    Publication statusPublished - 14-Jan-2011

    Keywords

    • INTERSTELLAR ICE ANALOGS
    • PHOTOION MASS-SPECTROMETRY
    • SOFT-X-RAY
    • AMINO-ACIDS
    • GAS-PHASE
    • ULTRAVIOLET-IRRADIATION
    • INDUCED DISSOCIATION
    • MOBILE PROTON
    • ENERGY-RANGE
    • EARTH ORBIT

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