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

Journal Article · Fri Jan 14 00:00:00 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]

---

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, Vol. 134, Issue 2; Other Information: DOI: 10.1063/1.3515301; (c) 2011 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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