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Dissociative recombination cross section and branching ratios of protonated dimethyl disulfide and N-methylacetamide.

Journal article
Authors A al-Khalili
R Thomas
A Ehlerding
F Hellberg
W D Geppert
Vitali Zhaunerchyk
M af Ugglas
M Larsson
E Uggerud
J Vedde
C Adlhart
J Semaniak
M Kaminska
R A Zubarev
F Kjeldsen
Patrik U Andersson
F Österdahl
V A Bednarska
A Paal
Published in The Journal of chemical physics
Volume 121
Issue 12
Pages 5700-8
ISSN 0021-9606
Publication year 2004
Published at Department of Chemistry
Pages 5700-8
Language en
Subject categories Physical Chemistry


Dimethyl disulfide (DMDS) and N-methylacetamide are two first choice model systems that represent the disulfide bridge bonding and the peptide bonding in proteins. These molecules are therefore suitable for investigation of the mechanisms involved when proteins fragment under electron capture dissociation (ECD). The dissociative recombination cross sections for both protonated DMDS and protonated N-methylacetamide were determined at electron energies ranging from 0.001 to 0.3 eV. Also, the branching ratios at 0 eV center-of-mass collision energy were determined. The present results give support for the indirect mechanism of ECD, where free hydrogen atoms produced in the initial fragmentation step induce further decomposition. We suggest that both indirect and direct dissociations play a role in ECD.

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