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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"Triplet state"”.
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Triplet-State Dynamics of Biacetyl
Made available in DSpace on 2014-12-10T23:01:47Z (GMT). No. of bitstreams: 1 7412126.pdf: 3797227 bytes, checksum: 16d9b347311bc44a4c69faae2134fc39 (MD5) Previous issue date: 1973
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Spectroscopic investigations of intersystem crossing and triplet state structure in acetylene
… yielded a complete characterization of singlet-triplet interactions relevant to intersystem crossing in the region of the 3v3 vibrational level of the A 1A, excited electronic state of acetylene. Intersystem crossing proceeds through a "doorway" state which has been plausibly assigned as a …
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Investigation of the Triplet State Properties of Bis(chlorophyll)cyclophane and Its Partially Metalated Derivatives
… macrocycles. The properties of the photoexcited triplet state of the cyclophanes were studied using light modulated EPR (electron paramagnetic resonance) techniques on frozen solutions at 9K.
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The lowest excited triplet state of some aromatic keto compounds: phosphorescence and optically detected magnetic resonance
Contains fulltext : mmubn000001_026587947.pdf (Publisher’s version ) (Open Access)
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Part One. Electron Spin Resonance Study of Quadrupole Coupling in Copper(ii) Complexes. Part Two. Triplet State Esr Spectra of Binuclear Vanadyl(iv) Tartrates
Made available in DSpace on 2014-12-09T17:36:51Z (GMT). No. of bitstreams: 1 7021067.pdf: 2769883 bytes, checksum: debee4eea50e0a303315992999a60975 (MD5) Previous issue date: 1970
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Density functional theory study of the conductivity of the biphenalenyl radical dimer
… neurtral radical in its singlet and triplet states. We performed calculations on the dimer to study its conductivity by investigating the ground state energy, HOMO-LUMO gap, charge localization, and reorganization energies, as these are the main contributing factors to crystal …
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Solute effects on the production and decay of primary species in the flash photolysis of indole
… the indolyl neutral radical and the indole triplet state have been obtained in the microsecond, broadband (X > 260 nm) flash photolysis of helium-saturated, neutral aqueous solutions of indole, in the absence and in the presence of the solutes NaBr, BaCl2*2H20 and CdSCV Fluorescence spectra …
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Triplet Excitons in Natural Photosynthetic and Artificial Light Harvesting Systems: Measurement and Modeling.
… oxygen (1O2) by energy transfer from the (B)Chl triplet state (3(B)Chl) to the oxygen ground state. Natural photosynthetic systems must protect themselves from 1O2, typically done by positioning carotenoids within a few angstroms of each (B)Chl molecule to quench 3(B)Chl states. Using …
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Controlling molecules with lasers and lasers with molecules
… laser pulses in order to produce a desired state or state change. Interesting pulse shapes have been able to break chemical bonds, drive chemical reactions, selectively excite molecular states, and most recently, control photoisomerization in proteins [1, 2, 3]. In this thesis I began by …
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Tuning the photophysical properties of amidophosphine complexes of copper
… (TDDFT) calculations indicate emission from a triplet state in all cases. The calculations also successfully correlate the energy of the transition from this triplet state to the energy of the observed emission. Such luminescence from a first-row metal is highly unusual, especially when …
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Quantum State Singlet-Triplet Character Control in 7Li2
… levels (the G1Πg (12, 21f) and 13Sg- (1, 21f) states separated by 720 MHz). In the absence of any optical fields, the spin-orbit interaction couples the two states, resulting in each state being a mixture of the pure singlet and pure triplet states. The initial mixing coefficients are governed …
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Reducing recombination in organic photovoltaics
… energy level cascades and promotion of triplet state excitons. The former relies on a thin layer of material placed between the active layers of a photovoltaic device to destabilize excitons. If the interfacial material is chosen properly, it can significantly improve device performance. …
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Laser-Induced Fluorescence Studies of Molecular Dynamics
… have been recorded for the excited singlet state of each molecule. In particular, the fluorescence of biacetyl in a molecular beam has been shown to exhibit the quantum beat effect in the time-resolved fluoresence. By the use of a simple, perturbation theory-derived analysis and also a more …
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DIARYL NITRENIUM IONS: ELECTRONIC STATE REACTIONS, MECHANISTIC STUDIES, AND PEPTIDE LABELING
… nitrenium ion 2 raises the triplet state energy by approximately 8 kcal/mol, it’s singlet state reaction rates are only minorly decreased. Chapter 3 investigates diaryl nitrenium ions’ mechanism with H-atom donors as the parent amine has been reported in the literature as …
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Electron Paramagnetic Resonance Studies of Copper(ii) Complexes. Part I: Quadrupole Coupling Constants of Square Planar Copper(ii) Complexes. Part Ii: Simulation of Electron Paramagnetic Resonance Spectra of Powders. Part Iii: Effects of the Nuclear Quadrupole Interactions on the Electron Paramagnetic Resonance Spectra of the Triplet State of Copper(ii) Dimers
Made available in DSpace on 2014-12-13T20:09:49Z (GMT). No. of bitstreams: 1 7607011.pdf: 3555309 bytes, checksum: 1dd70c35d1e9564576f79890e0bb3b0f (MD5) Previous issue date: 1975
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Functional Imaging Through Dark State Dynamics
… the environmental sensitivity of the dark states of molecular fluorophores, both endogeneous in cells/tissue and externally introduced for mapping of chemical micro-environments including factors such as ion concentration and microviscosity. A novel technique for directly detecting the …
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Light-Harvesting, Redox Control, and Biomimicry of the Photosynthetic Antennas of Green Sulfur Bacteria
… to the chlorosome, we studied, using steady-state and time-resolved spectroscopic methods, the effect of incorporation of an expected, but as-yet-undiscovered-in-nature, light-harvesting pigment into the complex, Bacteriochlorophyll (BChl) f. We show that BChl f is a fully functional pigment …
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Solution photochemistry of derivatives of Michler's Ketone
… species which were assigned to the excited triplet state and to the ketyl radical. The transient absorption spectra of the former were recorded. The decay kinetics of both species were found to be strongly dependent on the age of the ketone sample; different kinetics were observed for new …
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Ultrafast electron transfer and intersystem crossing in bimetallic molecules
… evidence of long-lived FeII ligand-field excited states, suggesting that the MMCT state decays by subpicosecond ISC and back ET (BET). Using synchrotron-based K-edge X-ray transient absorption (XTA), the longest-lived excited state is characterized as an FeII high-spin based on the metal-ligand …
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