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

Journal Article · Thu Jan 13 23:00:00 EST 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3515301· OSTI ID:21559974

Bari, S; Gonzalez-Magana, O; Reitsma, G; Hoekstra, R; Schlathoelter, T ^[1]; Werner, J; Schippers, S ^[2]

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1. KVI Atomic and Molecular Physics, University of Groningen, Zernikelaan 25, 9747AA Groningen (Netherlands)
2. Institut fuer Atom- und Molekuelphysik, Justus-Liebig-Universitaet, Leihgesterner Weg 217, 35392 Giessen (Germany)

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.

• OSTI ID: 21559974
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 2 Vol. 134; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
AMINO ACIDS
AUTONOMIC NERVOUS SYSTEM AGENTS
BOSONS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
COLLISIONS
COMPLEXES
DECOMPOSITION
DISSOCIATION
DRUGS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENDORPHINS
ENERGY RANGE
ENKEPHALINS
EV RANGE
FAR ULTRAVIOLET RADIATION
FUNCTIONS
HYDROXY ACIDS
IONIZATION
IONS
LASERS
LEAD
LEUCINE
LOSSES
MASS SPECTRA
MASSLESS PARTICLES
METALS
MOLECULE COLLISIONS
NEUROREGULATORS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PEPTIDES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
PHOTONS
POLYPEPTIDES
PROTEINS
RADIATIONS
SPECTRA
TIME-OF-FLIGHT METHOD
TYROSINE
ULTRAVIOLET RADIATION
WAVELENGTHS