|Title:||Dissociative recombination cross section and branching ratios of protonated dimethyl disulfide and N-methylacetamide|
|Authors :||Al-Khalili, A.|
Geppert, W. D.
Ugglas, M. af
Zubarev, R. A.
Andersson, P. U.
Bednarska, V. A.
|Published in :||Journal of Chemical Physics|
|Publisher / Ed. Institution :||A I P Publishing LLC|
|Publisher / Ed. Institution:||College Park, Maryland, USA|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|Subjects :||Biomolecules; Electron capture; Collisions; Proteins; Dissociation; Molecular dissociation; Peptides|
|Subject (DDC) :||540: Chemistry|
|Abstract:||Di-Me disulfide (DMDS) and N-methylacetamide are two first choice model systems that represent the disulfide bridge bonding and the peptide bonding in proteins. These mols. are therefore suitable for study of the mechanisms involved when proteins fragment under electron capture dissocn. (ECD). The dissociative recombination cross sections for both protonated DMDS and protonated N-methylacetamide were detd. at electron energies ranging from 0.001 to 0.3 eV. Also, the branching ratios at 0 eV center-of-mass collision energy were detd. The present results give support for the indirect mechanism of ECD, where free hydrogen atoms produced in the initial fragmentation step induce further decompn. Probably both indirect and direct dissocns. play a role in ECD.|
|Departement:||Life Sciences und Facility Management|
|Organisational Unit:||Institute of Chemistry and Biotechnology (ICBT)|
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen Life Sciences und Facility Management|
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