Resonance Enhanced Multiphoton Ionization Studies of Dichlorotoluenses, Dichloroanilines, and Dichlorophenols

dc.contributor.advisorWestwood, Nick
dc.contributor.authorde Laat, Richard
dc.date.accessioned2013-01-09T15:50:47Z
dc.date.available2013-01-09T15:50:47Z
dc.date.copyright2012-11
dc.date.created2012-11-09
dc.date.issued2013-01-09
dc.degree.departmentDepartment of Chemistryen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameDoctor of Philosophyen_US
dc.degree.programmeChemistryen_US
dc.description.abstractA new instrument using a time-of-flight (TOF) mass filter (MF) for resonance enhanced multiphoton ionization (REMPI) studies of gas phase molecules was developed. This instrument was designed to make use of the selectivity of the REMPI process and the sensitivity of a TOF-MF with a microchannel plate detector. A pulsed valve inlet system was tested to determine its effectiveness in “cooling” molecules but it was not used for the bulk of the studies performed. The instrument was tested using molecular and atomic bromine, atomic carbon, and atomic iodine. The atomic bromine, carbon, and iodine, were generated by the photodissociation of molecular bromine, hydrocarbons, and methyl iodide respectively. Nitrogen gas in air was used to test the pulsed valve system. The instrument was then used to conduct REMPI studies of five dichlorotoluene (DCT) isomers (2,4-DCT; 2,5-DCT; 3,4-DCT; 2,6-DCT; and 2,3-DCT). REMPI studies of six dichloroaniline (DCA) isomers, including 2,5-DCA; 3,4-DCA; 3,5-DCA; 2,6-DCA; 2,4-DCA; and 2,3-DCA were conducted. Six isomers of dichlorophenol (DCP) were studied (2,5-DCP; 3,4-DCP; 3,5-DCP; 2,3-DCP; 2,4-DCP; and 2,6-DCP). It was determined that the 2,3-DCP; 2,4-DCP; and 2,6-DCP isomers photodissociated to form CCl, which itself could be observed through a REMPI process. The results from the REMPI studies of the dichloroaromatics and data from previous ultraviolet, infrared, and RAMAN studies of these molecules was used in order to assign the observed peaks. The observed 0,0 π→π* transition energies of the dichloroaromatics studied were used along with ultraviolet 0,0 π→π* transition energies from previous works in order to discuss substituent effects. A qualitative method of predicting the relative location of 0,0 π→π* transition energies of dichloroaromatics was developed.en_US
dc.identifier.urihttp://hdl.handle.net/10214/5262
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectREMPIen_US
dc.subjectresonance ionizationen_US
dc.subjectdichloroanilineen_US
dc.subjectdichlorotolueneen_US
dc.subjectdichlorophenolen_US
dc.subjectCClen_US
dc.subjectmultiphoton ionizationen_US
dc.subjecttime-of-flighten_US
dc.subjectmass spectroscopyen_US
dc.subject0,0 transition energiesen_US
dc.subjectsubstituent effectsen_US
dc.titleResonance Enhanced Multiphoton Ionization Studies of Dichlorotoluenses, Dichloroanilines, and Dichlorophenolsen_US
dc.typeThesisen_US

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