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Resonant neutral particle emission in collisions of electrons with protonated peptides with disulfide bonds at high energies



T. Tanabe, K. Noda, S. Miyagi, N. Kurita, S. Tanaka, J. Setzler, W. Wenzel, E. B. Starikov, and G. Cuniberti

Chemical Physics Letters 504, 83 (2011)

Electron-ion collisions were studied for various protonated peptide monocations with disulfide bonds, using an electrostatic storage-ring equipped with a merged-electron-beam device. Resonant neutral particle emissions at the energies of 6-7 eV were observed, as well as a rise towards zero-energy, which are typical electron-capture dissociation profiles. The presence of disulfide (S-S) bonds tends to enhance the resonant bump heights. Chemical nature of the amino-acid residues adjacent to cysteines appears to correlate with the bump strength. Molecular-dynamical simulations help clarify the role of molecular vibration modes in the electron-capture dissociation process.



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doi absolute link10.1016/j.cplett.2011.01.058
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