ISOTOPE EFFECTS IN THE STATE-RESOLVED COLLISION DYNAMICS OF HIGHLY EXCITED MOLECULES

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dc.contributor.advisorMullin, Amy Sen_US
dc.contributor.authorEchebiri, Geraldine Onyinyechien_US
dc.contributor.departmentChemistryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2014-10-11T05:43:42Z
dc.date.available2014-10-11T05:43:42Z
dc.date.issued2014en_US
dc.description.abstractThe importance of highly excited molecules in the fields of combustion and atmospheric chemistry makes it essential to study pathways by which energy is lost from the excited molecule. One such pathway is by inelastic collisions with a bath molecule. In this dissertation, the collisional relaxation of highly excited pyrazine-h<sub>4</sub> (E<sub>vib</sub> = 37900 cm<super>-1</super>) and pyrazine-d<sub>4</sub> (E<sub>vib</sub> = 37900 cm<super>-1</super>) with HCl (300 K) is studied. The outcomes of the inelastic collision studies reveal quantum state-energy gaps of molecules and their intermolecular interactions affect the mechanism and dynamics of collisional energy transfer. The results from collisional relaxation of pyrazine-h<sub>4</sub> (E<sub>vib</sub> = 37900 cm<super>-1</super>) with HCl were compared to those from collisional relaxation of pyrazine-h<sub>4</sub> (E<sub>vib</sub>) with DCl in order to deduce the effects of quantum state-energy gaps on the dynamics of collisional energy transfer. The comparison shows the dynamics for collisional deactivation of pyrazine-h<sub>4</sub> (E<sub>vib</sub>) with HCl and DCl are different, and are possibly due to their intermolecular interactions with pyrazine-h<sub>4</sub> (E<sub>vib</sub>. The data for collisional relaxation of pyrazine-d<sub>4</sub> (E<sub>vib</sub> = 37900 cm<super>-1</super>) with HCl were compared to those for pyrazine-h<sub>4</sub> (E<sub>vib</sub>) + HCl collisions in order to determine the contributions of near-resonant vibrational energies of the collision partners on the collision dynamics. The comparison shows the energy transfer dynamics for collisional quenching of pyrazine-h<sub>4</sub> (E<sub>vib</sub>) and pyrazine-d<sub>4</sub> (E<sub>vib</sub>) with HCl are similar. The similarity in their energy transfer dynamics suggests near-resonance effects are not contributing significantly to the collision dynamics.en_US
dc.identifierhttps://doi.org/10.13016/M2BP45
dc.identifier.urihttp://hdl.handle.net/1903/15738
dc.language.isoenen_US
dc.subject.pqcontrolledEnergyen_US
dc.subject.pquncontrolledcollisionsen_US
dc.subject.pquncontrolledenergyen_US
dc.subject.pquncontrolledinelasticen_US
dc.subject.pquncontrolledmolecularen_US
dc.subject.pquncontrolledspectroscopyen_US
dc.subject.pquncontrolledtransienten_US
dc.titleISOTOPE EFFECTS IN THE STATE-RESOLVED COLLISION DYNAMICS OF HIGHLY EXCITED MOLECULESen_US
dc.typeDissertationen_US

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