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dc.contributor.advisorRobert Griffin.en_US
dc.contributor.authorCasey, Andrew (Andrew Byron)en_US
dc.contributor.otherMassachusetts Institute of Technology. Dept. of Chemistry.en_US
dc.date.accessioned2008-12-11T18:31:59Z
dc.date.available2008-12-11T18:31:59Z
dc.date.copyright2008en_US
dc.date.issued2008en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/43813
dc.descriptionThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2008.en_US
dc.descriptionIncludes bibliographical references (leaves 51-52).en_US
dc.description.abstractsolid State NMR (SSNMR) can determine molecular as well as supermolecular structure and dynamics. The low signal intensities make many of these experiments prohibitively long. Dynamic Nuclear Polarization provides a method of enhancing signal intensities and reducing experimental time. DNP requires transferring polarization from unpaired electrons to nuclei. Driving this transfer requires irradiation with high power microwaves which are generated with gyrotrons oscillators. We describe a series of modifications are made to an existing 140 GHz gyrotron allows for continuous wave operation and higher power and greater stability. DNP mechanisms are primarily limited to SSNMR. A method of using DNP to enhance liquid state NMR spectra is described. Signal enhancements of over 100 are reported for a solution of glucose. To obtain maximum DNP enhancements microwave irradiation times of up to 40 s are often required. While this increases your signal intensity for a single scan it decreases the gain from signal averaging for a given time. A method of choosing the optimum irradiation time is presented. DNP enhancements in continuous wave experiments exhibit an inverse field dependence. There are several pulsed DNP experiments exhibit no field dependence. To further study these techniques a pulsed 9 GHz EPR spectrometer has been assembled.en_US
dc.description.statementofresponsibilityby Andrew Casey.en_US
dc.format.extent52 leavesen_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectChemistry.en_US
dc.titleDynamic nuclear polarization for NMR : applications and hardware developmenten_US
dc.title.alternativeDynamic nuclear polarization for nuclear magnetic resonance : applications and hardware developmenten_US
dc.typeThesisen_US
dc.description.degreeS.M.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Dept. of Chemistry.en_US
dc.identifier.oclc262478643en_US


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