Recently,the three sugars ribose,deoxyribose,and fructose have been shown to undergo dissociative electron attachment at threshold,that is,to fragment upon capture of a zero-energy electron.Here the electron acceptor properties of three fructose isomers are investigated in view of a doorway mechanism.Two key ingredients for a doorway mechanism,a weakly bound state able to support a vibrational Feshbach resonance,and a valence anion more stable than neutral fructose are characterized.Moreover,possible structures for the observed fragment anion (fructose-H2O)-are suggested.
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