Academic literature on the topic 'Radical pairs'

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Dissertations / Theses on the topic "Radical pairs"

1

Shergill, Raminder. "Radicals and radical pairs in chemical and biological systems." Thesis, University of Leicester, 2010. http://hdl.handle.net/2381/11008.

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Magnetic fields of different strengths can be applied to chemical and biological systems to study processes involving radicals or radical pairs. This work uses two such techniques, electron paramagnetic resonance (EPR) spectroscopy (≥ 150 mT) in addition to time resolved EPR spectroscopy and time resolved infrared (TRIR) spectroscopy (≤ 37 mT). The former are used to monitor metalloproteins, and the photochemistry of phosphorus oxides, while TRIR spectroscopy is used to record the magnetic field effects on the reaction kinetics of neutral radical pairs. The thesis begins with an introduction a
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2

Till, Ulrike. "Recombination kinetics of radical pairs." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267949.

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3

Lewis, Alan. "Spin dynamics in radical pairs." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:45f5b9a7-534d-4b4f-aca7-b87f57eb2840.

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The coherent spin dynamics of radical pairs play a crucial role in their reactions, which consequently cannot be described by a simple kinetic scheme. Instead, simulations of the spin dynamics are required in order to predict the rate and outcome of radical pair reactions, and especially their response to the application of a magnetic field. Unfortunately, the number of spin states of the radical pair increases exponentially with the number of nuclear spins, making deterministic quantum mechanical simulations of realistic radical pairs difficult. To overcome this difficulty, this thesis begins
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Qureshi, Tariq. "Spin chemistry." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365292.

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5

Nattrass, Stephen R. "Optically detected magnetic resonance of radical pairs." Thesis, University of Oxford, 1987. http://ora.ox.ac.uk/objects/uuid:cdddfd9c-1ec3-4661-801a-d80dad1a853d.

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Current theories of the effects of static and resonant high frequency magnetic fields on radical pair reaction are presented with a view to establishing how they can form the basis of the high time resolution liquid phase magnetic resonance techniques of MARY and RYDMR. Approximate calculations are performed to reveal RYDMR spectral details for the case of an initial triplet radical pair. The design of unique apparatus to explore the capabilities of the techniques, and routinely collect quantitative data to test theoretical predictions, is described. This includes the development of an ultra-f
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6

Hunter, David A. "Spin-correlated radical pairs in photosynthetic systems, micelles and liquids." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253134.

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7

Hogben, Hannah J. "Coherent spin dynamics of radical pairs in weak magnetic fields." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:61c4ab7e-406f-4193-949a-b5a70f43e3e1.

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The outcome of chemical reactions proceeding via radical pair (RP) intermediates can be influenced by the magnitude and direction of applied magnetic fields, even for interaction strengths far smaller than the thermal energy. Sensitivity to Earth-strength magnetic fields has been suggested as a biophysical mechanism of animal magnetoreception and this thesis is concerned with simulations of the effects of such weak magnetic fields on RP reaction yields. State-space restriction techniques previously used in the simulation of NMR spectra are here applied to RPs. Methods for improving the efficie
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Carpenter, Joanna Katharine Hicks. "Magnetic field effects on electron transfer reactions in photosynthetic bacteria." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390466.

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9

Kleinman, Mark Howard. "The Dynamics of benzylic radical pairs in organized media : binding and mobility." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34272.pdf.

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10

Fursman, Catherine E. "Electron spin echo envelope modulation spectroscopy of radical pairs in photosynthetic bacteria." Thesis, University of Oxford, 2000. http://ora.ox.ac.uk/objects/uuid:1ccaf0e5-3a45-4f13-a184-a4f1cf772c9b.

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Electron spin echo envelope modulation (ESEEM) spectroscopy is widely used to study the radical pairs created during the primary steps of photosynthesis. In this thesis the analysis of ESEEM spectra is improved, and some new applications and variations of this experiment suggested. Experimental spectra from species such as P<sup>+</sup>Q<sup>-</sup><sub>A</sub>, the secondary radical pair formed in the reaction centre of the bacterium Rhodobacter sphaeroides, give information about the exchange and dipolar couplings between the radicals. The model used to analyse the data affects the results;
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