Vacuum ultraviolet action spectroscopy of polysaccharides.
Résumé
We studied the optical properties of gas-phase polysaccharides (maltose, maltotetraose, and maltohexaose) ions by action spectroscopy using the coupling between a quadrupole ion trap and a vacuum ultraviolet (VUV) beamline at the SOLEIL synchrotron radiation facility (France) in the 7 to 18 eV range. The spectra provide unique benchmarks for evaluation of theoretical data on electronic transitions of model carbohydrates in the VUV range. The effects of the nature of the charge held by polysaccharide ions on the relaxation processes were also explored. Finally the effect of isomerization of polysaccharides (with melezitose and raffinose) on their photofragmentation with VUV photons is presented.
Mots clés
Vacuum ultraviolet
Spectroscopy
Polysaccharides
Gas phase
Fragmentation
Mass spectrometry
ELECTRON PHOTODETACHMENT DISSOCIATION
LASER-INDUCED PHOTOFRAGMENTATION
CIRCULAR-DICHROISM SPECTROSCOPY
SYNCHROTRON-RADIATION
GAS-PHASE
PROTEIN POLYANIONS
OPTICAL-PROPERTIES
MASS-SPECTROMETRY
BASIS-SETS
IN-VACUO