Resonant neutral-particle emission in collisions of electrons with peptide ions in a storage ring |
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Authors: | Tanabe T Noda K Saito M Lee S Ito Y Takagi H |
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Affiliation: | High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan. |
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Abstract: | Electron-biomolecular ion collisions were studied using an electrostatic storage ring with a merging beam technique for singly protonated peptides (angiotensin I, II, and III). A strong neutral-particle emission at around 6.5 eV was found in addition to neutrals from recombination at low energies. The rates of the high-energy peak greatly decreased with a slight decrease in the number of amino-acid residues from angiotensin I to III. These results suggest that some peptide bonds were selectively cleaved. |
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