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dc.creatorLester, Marsha I.en_US
dc.date.accessioned2006-06-15T19:19:25Z
dc.date.available2006-06-15T19:19:25Z
dc.date.issued1999en_US
dc.identifier1999-TA-01en_US
dc.identifier.urihttp://hdl.handle.net/1811/19419
dc.description$^{a}$ The Office of Basic Energy Sciences of the Department of Energy has supported this research. The Chemistry Division of the National Science Foundation has also provided partial equipment support.en_US
dc.descriptionAuthor Institution: Department of Chemistry, University of Pennsylvaniaen_US
dc.description.abstractThe bimolecular reactions of hydroxyl radicals with hydrogen and methane play a fundamental role in the combustion of hydrocarbon fuels. This laboratory is examining the $OH + H_{2}$ and $OH + CH_{4}$ hydrogen abstraction reactions from a new perspective by trapping the reactants within a shallow attractive well in the entrance channel to reaction. The resultant $H_{2}-OH$ and $CH_{4}-OH$ reactant complexes are then vibrationally activated through infrared or stimulated Raman excitation. A variety of double resonance schemes have been implemented to record the spectra, lifetime, and product state distributions of the vibrationally activated complexes. Vibrational spectroscopy provides an effective means to examine the structural parameters of these complexes in their ground electronic state. Intermolecular bending excitation is found to control the relative orientation of the reactants within the complex, producing some that resemble the transition state structure. The OH, $H_{2}$, or $CH_{4}$ vibrational excitation also supplies sufficient energy to surmount the activation barrier and thereby may induce chemical reaction. Alternatively, the vibrational excitation can cause the weak intermolecular bond to break through vibrational predissociation. Time- and frequency-domain measurements reveal how long the initial excitation stays localized in the $OH, H_{2}$, or $CH_{4}$ mode and how excess energy is partitioned among the products. The experimental results will also be compared with theoretical calculations of the observables to yield new insights on the potential energy surfaces for the $OH + H_{2}$ and $OH + CH_{4}$ systems.en_US
dc.format.extent165615 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleVIBRATIONAL SPECTROSCOPY AND CHEMICAL DYNAMICS IN REACTANT COMPLEXES OF HYDROXYL RADICALS WITH HYDROGEN AND $METHANE^{a}$en_US
dc.typearticleen_US


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