Controlling molecular fragmentation using low energy electrons

We show that functional group dependence exists in dissociative attachment of electrons to molecules and this leads to site and bond selectivity in fragmenting organic molecules at the N-H, O-H and C-H sites using electron energy as a control parameter. This phenomenon is investigated further by mea...

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Bibliographic Details
Published in:Journal of physics. Conference series 2007-11, Vol.88 (1), p.012073
Main Authors: Krishnakumar, E, Prabhudesai, V S, Ram, N Bhargava
Format: Article
Language:English
Subjects:
Electron attachment
Electron energy
Fragmentation
Functional groups
Hydrides
Imaging techniques
Momentum
Organic chemistry
Physics
Selectivity
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Summary:We show that functional group dependence exists in dissociative attachment of electrons to molecules and this leads to site and bond selectivity in fragmenting organic molecules at the N-H, O-H and C-H sites using electron energy as a control parameter. This phenomenon is investigated further by measuring the momentum distribution of hydride ions using the newly developed ion momentum imaging technique. We find that while the electron attachment at the O-site leads to a two-body fragmentation, attachment at the C-site leads to few-body fragmentation. Several new phenomena like 'bond orientation dependent electron attachment' and direct screening of one part of the molecule by another part to the incoming electron are unravelled in the very rich momentum distribution data of the hydride ions that we have obtained at various resonances.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/88/1/012073