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

A. Ai-Khaiili*, R. Thomas, A. Ehlerding, F. Hellberg, W. D. Geppert, V. Zhaunerchyk, M. Af Ugglas, M. Larsson, E. Uggerud, J. Vedde, C. Adlhart, J. Semaniak, M. Kamińska, R. A. Zubarev, F. Kjeldsen, P. U. Andersson, F. Österdahl, V. A. Bednarska, A. Paál

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Abstrakt

The disscoiative ion-electron recombination (DR) cross section and branching ratios in protonated dimethyl disulfide (DMDS) and N-methylacetamide, were analyzed at electron energies ranging from 0.001 to 0.3 eV. The protonated molecules of DMDS and N-methylacetamide-2,2,2-d3 were used to measure DR branching ratios at 0 eV collision energy. It was observed that cleavage of CSS-C bond was most dominant channel in the protonated DMDS. The dominant channel for recombination of protonated N-methylacetamide-2,2,2-dI3I results in production of a hydrogen atom. The results show that protonated proteins may release hydrogens upon electron capture dissociation (ECD) and some of the cleavages observed are hydrogen capture induced.

OriginalsprogEngelsk
TidsskriftJournal of Chemical Physics
Vol/bind121
Udgave nummer12
Sider (fra-til)5700-5708
Antal sider9
ISSN0021-9606
DOI
StatusUdgivet - 22. sep. 2004

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