Index Catalog // Arch : Northwestern University Institutional Repository

Revealing Vibronic Coupling and Coherence in Molecular Aggregates with Multidimensional Spectroscopy: Experiment and Theory

Description:: Quantum mechanical phenomena are playing tremendous roles in many areas of chemistry and materials science research. In recent years, the potential role of coupling between electronic and vibrational degrees of freedom in photochemical processes has been widely researched. Despite its potential to improve molecular technologies, the lack of studies focusing...
Keyword:: Coherence, Quantum, Excitons, Vibronic coupling, Spectroscopy, and Photophysics
Subject:: Physical chemistry, Molecular physics, and Quantum physics
Creator:: Schultz, Jonathan David
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 09/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_929572 and http://dissertations.umi.com/northwestern:16278

Fundamental Electron Transfer and Spin Dynamics in Organic Donor-Acceptor Systems for Quantum Information Science Applications

Description:: This thesis contains two research projects. The first research project examined the coherent nature of electron transfer in two donor-acceptor dyads – one single acceptor control compound and one dual acceptor molecule of interest. Using transient absorption spectroscopy in the ultraviolet/visible/near-infrared and mid-infrared regions, magnetic field effect experiments, and theoretical...
Subject:: Physical chemistry
Creator:: Bancroft, Laura
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 09/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_916314 and http://dissertations.umi.com/northwestern:16150

Defect engineering for more reliable and efficient PbTe-based thermoelectric materials

Description:: Thermoelectric devices utilize semiconducting n-type and p-type thermoelectric materials to convert heat into electricity. Despite their promise for deep space power generation or waste heat recovery, most high-performing thermoelectric materials reported in literature are absent in practical applications - partially due to inconsistent synthesis and poor mechanical performance. This work...
Keyword:: Thermoelectrics, Doping, Phase Equilibrium, Defects, Mechanical Properties, and Semiconductors
Subject:: Physical chemistry, Materials Science, and Energy
Creator:: Male, James Patrick
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 06/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_879755 and http://dissertations.umi.com/northwestern:15943

Control of Light-Induced Electronic Behavior at Interfaces of Hybrid Nanomaterials

Description:: This dissertation explores ways to utilize physical parameters at the nanoscale interface to control the properties of mixed-dimensional heterojunctions (MDHJs). MDHJs combine the desirable properties of different classes of low-dimensional nanomaterials (materials that are quantum confined in at least one dimension). While MDHJs have achieved superlative performance for a variety...
Keyword:: photophysics, mixed-dimensional, low-dimensional, time-resolved spectroscopy, and nanomaterials
Subject:: Physical chemistry, Nanoscience, and Materials Science
Creator:: Padgaonkar, Suyog
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/07/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_827806 and http://dissertations.umi.com/northwestern:15611

Surface Chemistry of Organic Molecules in Atmospheric and Indoor Environments Investigated by Sum Frequency Generation Spectroscopy

Description:: This work examines important heterogeneous processes of organic molecules on surfaces, in the contexts of atmospheric and indoor environments. In large forest ecosystems, biogenic secondary organic aerosols (SOAs) constitute a dominant fraction of organic particulate matter in the atmosphere. The formation of SOAs starts from the emission of volatile organic...
Subject:: Physical chemistry, Chemistry, and Environmental science
Creator:: Liu, Yangdongling
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/07/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15742 and etdadmin_upload_844595

The Rise and Promise of Artificial Molecular Machines

Description:: In this Thesis, I describe some recent developments in the field of artificial molecular machines to which I have made contributions. In Chapter 1, I survey the rise and promise of molecular nanotopology, a relatively new discipline focusing on molecular knots and links that offers unprecedented opportunities to access high-energy...
Keyword:: Supramolecular Chemistry, Molecular Pump, Mechanically Interlocked Molecules, Polyrotaxane, Artificial Molecular Machines, and Molecular Nanotopology
Subject:: Organic chemistry, Physical chemistry, and Polymer chemistry
Creator:: Feng, Yuanning
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/06/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15655 and etdadmin_upload_834376

Strategies to Control the Redox Activity of Quantum Dots through their Surface Chemistry

Description:: This dissertation describes the study of photoinduced charge transfer between QDs and molecular acceptors as a probe of the defects within ligand shells of QDs and as means to photocatalyze redox reactions. For charge transfer reactions to occur between QDs and molecules in bulk solution, the molecules must interact with...
Keyword:: Quantum dots, Photoredox, Photochemical deprotection, Fluorinated ligands, and Surface chemistry
Subject:: Physical chemistry and Chemistry
Creator:: Perez, Kaitlyn
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/01/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15131 and etdadmin_upload_743985

Excited-State Processes in Covalent Dimers Investigated with Time-Resolved Electronic and Vibrational Spectroscopy

Description:: Numerous photophysical processes in both natural and artificial systems are dictated by the interaction between chromophores. For example, in photosynthesis, light is absorbed by an antenna complex composed of an array of chlorophyll chromophores that collectively transfer the energy to the reaction center where interactions between a series of redox...
Keyword:: Time-resolved spectroscopy, Electron transfer, Photophysics, Quantum coherence, Singlet fission, and Excimer
Subject:: Physical chemistry
Creator:: Phelan, Brian Thomas
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_633520 and http://dissertations.umi.com/northwestern:14489

Photoexcited Rylenediimide Radical Anions and Dianions for the Photoreduction of Carbon Dioxide Reduction Catalysts

Description:: The development and use of organic anionic chromophores that absorb the entire visible spectrum & into the near-infrared region while providing highly reducing equivalents is pinnacle for artificial photosynthesis. This dissertation investigates the rational design of new donor-acceptor systems for artificial photosynthesis that couple naphthalene diimide (NDI)/perylene diimide (PDI) radical...
Keyword:: Naphthalene Diimide, Perylene Diimide, Carbon Dioxide, Re(bpy)(CO)3, Mn(bpy)(CO)3, and Radical Anions
Subject:: Organic chemistry and Physical chemistry
Creator:: Martinez, Jose Fabian
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_613990 and http://dissertations.umi.com/northwestern:14388

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Revealing Vibronic Coupling and Coherence in Molecular Aggregates with Multidimensional Spectroscopy: Experiment and Theory

Fundamental Electron Transfer and Spin Dynamics in Organic Donor-Acceptor Systems for Quantum Information Science Applications

Defect engineering for more reliable and efficient PbTe-based thermoelectric materials

Control of Light-Induced Electronic Behavior at Interfaces of Hybrid Nanomaterials

Surface Chemistry of Organic Molecules in Atmospheric and Indoor Environments Investigated by Sum Frequency Generation Spectroscopy

The Rise and Promise of Artificial Molecular Machines

Strategies to Control the Redox Activity of Quantum Dots through their Surface Chemistry

Excited-State Processes in Covalent Dimers Investigated with Time-Resolved Electronic and Vibrational Spectroscopy

Photoexcited Rylenediimide Radical Anions and Dianions for the Photoreduction of Carbon Dioxide Reduction Catalysts

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