Abstract
Dissociative electron attachment to gas phase dimethyl sulphide (CH3SCH3) and dimethyl disulphide (CH3SSCH3) has been studied by means of a crossed beams apparatus. Cleavage of the C–S bond within CH3SCH3 and the S–S bond within CH3SSCH3 is observed within a resonance in the energy range below 2 eV and visible preferentially via the appearance of the fragment CH2S−. The striking finding is that the intensity of CH2S− generated from CH3SSCH3 is more than two orders of magnitude higher than the intensity of the respective anionic fragment generated from CH3SCH3. Our results clearly demonstrate that the CH3SSCH3 molecule, which contains disulphide bridge is substantially more sensitive towards electron attachment resulting mainly in dissociation along the S–S bridge.
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Contribution to the Topical Issue “COST Action Nano-IBCT: Nano-scale Processes Behind Ion-Beam Cancer Therapy”, edited by Andrey Solov’yov, Nigel Mason, Gustavo García, Eugene Surdutovich.
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Kopyra, J., Władziński, J. Electron driven processes in sulphur containing compounds CH3SCH3 and CH3SSCH3 . Eur. Phys. J. D 69, 157 (2015). https://doi.org/10.1140/epjd/e2015-60184-6
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DOI: https://doi.org/10.1140/epjd/e2015-60184-6