Jan 19, 2011

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

The Journal of Chemical Physics
Sadia BariThomas Schlathölter

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.

  • References22
  • Citations23

Citations

Mentioned in this Paper

Photoabsorption [MoA]
Protons
Quantum Theory
Enkephalin, Leucine
Cations
Tyrosine Measurement
Leucine
Photoabsorption
Tyrosine
Enkephalins

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