| EPSRC Reference: |
GR/K04248/01 |
| Title: |
VERY LOW ENERGY ELECTRON ATTACHMENT, DISSOCIATIVE ATTACHMENT AND ELECTRON MOLECULE SCATTERING |
| Principal Investigator: |
Field, Dr D |
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| Department: |
Chemistry |
| Organisation: |
University of Bristol |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1995 |
Ends: |
31 December 1997 |
Value (£): |
227,975
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Summary on Grant Application Form |
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We propose to study electron attachment (EA), dissociative attachment (DA) and electron scattering using magnetically collimated electron beams, generated by synchrotron threshold photoionisation of Ar (using the Daresbury SRS), with an electron kinetic energy resolution of 3-4 meV (FWHM) in the energy range <10 mev to several hundred meV. The tried and tested experimental system is unique in being able to form electron beams at these very low energies, virtually unexplored in beam experiments, and allows qualitatively new experiments to be performed. Our target molecules are hydrocarbons, (per) halogenated hydrocarbons, and small inorganic molecules (eg SF6, H20, NH3 etc). Electron beam-gas cell experiments will measure absolute scattering cross-sections for pure rotational excitation in polar molecules, and in nonpolar molecules we propose to characterise Ramsauer-Townsend minima. For low energy EA and DA, electron beam-gas cell experiments with mass-spectrometric analysis of product molecules will yield the variation of EA and DA cross-sections. Crossed electron beam-supersonic nozzle beam experiments will be performed to measure the mass analysed angular distribution of fragments in very low energy DA, giving information on the LUMOs involved and the lifetime of the parent negative ions. In a separate experiment, the kinetic energy of fragment ions will be measured, probing the statistical or non-statistical manner in which the exothermicity of DA is distributed in the molecular system before dissociation.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.bris.ac.uk |