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Title: VUV action spectroscopy of protonated leucine-enkephalin peptide in the 6-14 eV range

We have studied the VUV photodissociation of gas-phase protonated leucine-enkephalin peptide ion in the 5.7 to 14 eV photon energy range by coupling a linear quadrupole ion trap with a synchrotron radiation source. We report VUV activation tandem mass spectra at 6.7, 8.4 and 12.8 eV photon energies and photodissociation yields for a number of selected fragments. The obtained results provide insights into both near VUV radiation damage and electronic properties of a model peptide. We could distinguish several absorption bands and assign them to particular electronic transitions, according to previous theoretical studies. Furthermore, the photodissociation yields appear to be very different for the various observed fragmentation channels, depending both on the type of fragments and their position along the peptide backbone. The present results are discussed in light of recent gas-phase spectroscopic data on peptides.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Univ. of Belgrade, Belgrade (Serbia)
  2. UMR1324 Centre des Sciences du Gout et de l'Alimentation, Dijon (France)
  3. SOLEIL, Gif sur Yvette Cedex (France)
  4. SOLEIL, Gif sur Yvette Cedex (France); INRA, Nantes (France)
  5. Univ. of Belgrade, Belgrade (Serbia); Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
OSTI Identifier:
1234511
Grant/Contract Number:
FC02-04ER15533
Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 143; Journal Issue: 24; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS action spectroscopy; VUV; leucine-enkephalin; mass spectrometry; photons; peptides; photodissociation; mass spectra; bond cleavage