Abstract
Electron–biomolecular ion collisions were studied using an electrostatic storage ring with a merging beam technique for singly protonated peptides and multiply deprotonated DNA ions. The neutral-particle production rates according to collisions were measured. For peptides, resonant neutral-particle emissions were observed at a relative energy of 6.5 eV with a shoulder at around 9 eV. These resonances are deduced to come from electron capture and a subsequent cleavage of peptide bonds. For DNAs, neutral-particle emissions start from definite threshold energies, which depend on the ion charges. The neutrals come from a break of DNAs, rather than electron detachment.
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