Bari, S.S.BariGonzalez-Magana, O.O.Gonzalez-MaganaReitsma, G.G.ReitsmaWerner, J.J.WernerSchippers, StefanStefanSchippersHoekstra, R.R.HoekstraSchlatholter, T.T.Schlatholter2023-06-022012-02-242023-06-022011http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-86319https://jlupub.ub.uni-giessen.de/handle/jlupub/16377http://dx.doi.org/10.22029/jlupub-15757Until 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.enIn Copyrightphotodissociationgas-phase protonated leucine-enkephalin cations tyrosine side chain lossddc:530