Dissociation of methanol by ion-impact: Breakup dynamics, bond rearrangement and kinetic energy release

The dissociation dynamics of multiply charged methanol molecules formed in collision with 1.2 MeV Ar 8+projectiles is studied. Using coincidence mapping techniques, we can separate out the different dissociation pathways between carbon, oxygen and hydrogen ionic fragments as well as two- and three-b...

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Bibliographic Details
Published in:International journal of mass spectrometry 2008-09, Vol.276 (1), p.43-48
Main Authors: De, Sankar, Roy, A., Rajput, Jyoti, Ghosh, P.N., Safvan, C.P.
Format: Article
Language:English
Subjects:
Coincidence technique
Intramolecular bond rearrangement
Kinetic energy release
Molecular dissociation
Time-of-flight mass spectrometry
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Summary:The dissociation dynamics of multiply charged methanol molecules formed in collision with 1.2 MeV Ar 8+projectiles is studied. Using coincidence mapping techniques, we can separate out the different dissociation pathways between carbon, oxygen and hydrogen ionic fragments as well as two- and three-body breakup events. Reactions involving intramolecular bond rearrangements within the CH 3 group of the dissociative molecule are discussed in detail. A signature of hydrogen migration in doubly charged methanol is observed. Kinetic energy releases of different breakup channels are reported here and compared with values calculated from a Coulomb explosion model. The shape and orientation of the islands in the coincidence map give further information about the momentum balance in the fragmentation process of two- or many-body dissociation pathways.
ISSN:1387-3806
1873-2798
DOI:10.1016/j.ijms.2008.06.021