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HIGH RESOLUTION LASER STUDIES OF PHOTOINDUCED CHANGES IN MOLECULAR CHARGE DISTRIBUTIONS USING THE STARK EFFECT

Young, Justin (2011) HIGH RESOLUTION LASER STUDIES OF PHOTOINDUCED CHANGES IN MOLECULAR CHARGE DISTRIBUTIONS USING THE STARK EFFECT. Doctoral Dissertation, University of Pittsburgh.

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    Abstract

    Electronic excitation can lead to numerous subtle and dramatic changes in molecular systems. Such photoinduced events have been incorporated into biological systems through evolutionary means. However, despite the presence of fascinating photoinduced events in biological systems, much of the intricacies of photoinduced phenomena are not well understood. In part, this is because of the nature of electronically excited states, which generally exist for only nanoseconds, and typically return the system to its original state causing no permanent changes to the system. This dissertation presents, results concerning photoinduced phenomena observed with high resolution electronic spectroscopy. The high resolution results provide detailed structural information of isolated molecules and complexes in both the ground and excited electronic states. By coupling this method with the Stark-Effect, analysis also provides a description of how the distribution of charge changes upon photoexcitation. This proves to be a useful tool to detect phenomena such as charge transfer and electronic state mixing. Themes and systems presented in this dissertation include excited state intramolecular proton transfer in 5-fluorosalicylic acid, solvent induced charge transfer in 7-azaindole(H2O), electronic state mixing in 7-azaindole, and the role of torsional angles in conjugation of N-phenylcarbazole and 2-phenylindole.


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    Item Type: University of Pittsburgh ETD
    Contributors:
    ContributionNameEmailORCID
    Committee Chairpratt, davidpratt@pitt.edu
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Committee MemberRenĂ£, Robinson A. S.rena@pitt.edu
    Committee MemberPetek, Hrvojepetek@pitt.edu
    Committee MemberWaldeck, David H.dave@pitt.edu
    Committee ChairPratt, David W.Pratt@pitt.edu
    Title: HIGH RESOLUTION LASER STUDIES OF PHOTOINDUCED CHANGES IN MOLECULAR CHARGE DISTRIBUTIONS USING THE STARK EFFECT
    Status: Published
    Abstract: Electronic excitation can lead to numerous subtle and dramatic changes in molecular systems. Such photoinduced events have been incorporated into biological systems through evolutionary means. However, despite the presence of fascinating photoinduced events in biological systems, much of the intricacies of photoinduced phenomena are not well understood. In part, this is because of the nature of electronically excited states, which generally exist for only nanoseconds, and typically return the system to its original state causing no permanent changes to the system. This dissertation presents, results concerning photoinduced phenomena observed with high resolution electronic spectroscopy. The high resolution results provide detailed structural information of isolated molecules and complexes in both the ground and excited electronic states. By coupling this method with the Stark-Effect, analysis also provides a description of how the distribution of charge changes upon photoexcitation. This proves to be a useful tool to detect phenomena such as charge transfer and electronic state mixing. Themes and systems presented in this dissertation include excited state intramolecular proton transfer in 5-fluorosalicylic acid, solvent induced charge transfer in 7-azaindole(H2O), electronic state mixing in 7-azaindole, and the role of torsional angles in conjugation of N-phenylcarbazole and 2-phenylindole.
    Date: 01 December 2011
    Date Type: Completion
    Defense Date: 01 December 2011
    Approval Date: 01 February 2012
    Submission Date: 23 November 2011
    Release Date: 01 February 2012
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Number of Pages: 141
    Institution: University of Pittsburgh
    Thesis Type: Doctoral Dissertation
    Refereed: Yes
    Degree: PhD - Doctor of Philosophy
    Uncontrolled Keywords: High resolution electronic spectroscopy, Stark-Effect, 5-fluorosalicylic acid, 7-azaindole, electronic-state mixing, excited state proton transfer, charge transfer, phenylindole, phenylcarbazole
    Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
    Date Deposited: 01 Feb 2012 11:19
    Last Modified: 02 Feb 2012 01:15

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