{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25800"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25800","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The sensitivity of nuclear magnetic double resonance","abstract":"The dynamics of the nuclear magnetic double resonance process for Na nuclei in a (2,0,0) position relative to a substitutional Ag+ impurity in NaCl has been studied for several Ag concentrations. The purpose was to determine experimentally the factors which limit the double resonance sensitivity. For Ag concentrations below .03 mole %, the magnetization of unperturbed Na nuclei decayed exponentially with rates proportional to the impurity concentration when an rf field at the resonance frequency of the quadrupole shifted transitions was applied. Using a new method, intermittent search field irradiation, evidence was found that the finite spin diffusion rate caused a double resonance energy transfer rate under continuous search field irradiation about 30% less than the transfer rate which would be observed if the spin diffusion were infinitely fast. A theoretical explanation of the results is given using a perturbation approach based on the concept of spin diffusion. In addition, we have studied the Na spin lattice relaxation in the completely demagnetized state as a function of impurity concentration, and found a rapid initial decrease of spin order. This was caused by cross relaxation within then nuclear spin system.","abstract_html":"The dynamics of the nuclear magnetic double resonance process for Na nuclei in a (2,0,0) position relative to a substitutional Ag+ impurity in NaCl has been studied for several Ag concentrations. The purpose was to determine experimentally the factors which limit the double resonance sensitivity. For Ag concentrations below .03 mole %, the magnetization of unperturbed Na nuclei decayed exponentially with rates proportional to the impurity concentration when an rf field at the resonance frequency of the quadrupole shifted transitions was applied. Using a new method, intermittent search field irradiation, evidence was found that the finite spin diffusion rate caused a double resonance energy transfer rate under continuous search field irradiation about 30% less than the transfer rate which would be observed if the spin diffusion were infinitely fast. A theoretical explanation of the results is given using a perturbation approach based on the concept of spin diffusion. In addition, we have studied the Na spin lattice relaxation in the completely demagnetized state as a function of impurity concentration, and found a rapid initial decrease of spin order. This was caused by cross relaxation within then nuclear spin system.","abstract_has_math":false,"creators":["Spencer, Paul Roger"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Slichter, C.P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-13T19:14:43Z","date_published":"2011-07-13T19:14:43Z","updated_at":"2026-07-22T22:25:26Z","subjects":["nuclear magnetic double resonance","rf field","quadrupole shifted transitions"],"languages":["en"],"rights":["1969 Paul Roger Spencer"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6074723"],"render_values":[{"text":"6074723","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25800","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Slichter, C.P."]},{"key":"dc:creator","label":"Author","values":["Spencer, Paul Roger"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-13T19:14:43Z","10000-01-01","1969"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["nuclear magnetic double resonance","rf field","quadrupole shifted transitions"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1969 Paul Roger Spencer"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6074723","http://hdl.handle.net/2142/25800"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The dynamics of the nuclear magnetic double resonance process for Na nuclei in a (2,0,0) position relative to a substitutional Ag+ impurity in NaCl has been studied for several Ag concentrations. The purpose was to determine experimentally the factors which limit the double resonance sensitivity. For Ag concentrations below .03 mole %, the magnetization of unperturbed Na nuclei decayed exponentially with rates proportional to the impurity concentration when an rf field at the resonance frequency of the quadrupole shifted transitions was applied. Using a new method, intermittent search field irradiation, evidence was found that the finite spin diffusion rate caused a double resonance energy transfer rate under continuous search field irradiation about 30% less than the transfer rate which would be observed if the spin diffusion were infinitely fast. A theoretical explanation of the results is given using a perturbation approach based on the concept of spin diffusion. In addition, we have studied the Na spin lattice relaxation in the completely demagnetized state as a function of impurity concentration, and found a rapid initial decrease of spin order. This was caused by cross relaxation within then nuclear spin system.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-13T19:14:43Z No. of bitstreams: 1 1969_spencer.pdf: 3172221 bytes, checksum: 6fdc2aadee132e690f4ca5d264d0904b (MD5)","Made available in DSpace on 2011-07-13T19:14:43Z (GMT). No. of bitstreams: 1 1969_spencer.pdf: 3172221 bytes, checksum: 6fdc2aadee132e690f4ca5d264d0904b (MD5) Previous issue date: 1969","Restriction data tranferred 2014-07-01T11:33:20-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-13T19:14:43Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["The sensitivity of nuclear magnetic double resonance"]}]}],"canonical_facts":{"dc:contributor":["Slichter, C.P."],"dc:creator":["Spencer, Paul Roger"],"dc:date":["2011-07-13T19:14:43Z","10000-01-01","1969"],"dc:description":["The dynamics of the nuclear magnetic double resonance process for Na nuclei in a (2,0,0) position relative to a substitutional Ag+ impurity in NaCl has been studied for several Ag concentrations. The purpose was to determine experimentally the factors which limit the double resonance sensitivity. For Ag concentrations below .03 mole %, the magnetization of unperturbed Na nuclei decayed exponentially with rates proportional to the impurity concentration when an rf field at the resonance frequency of the quadrupole shifted transitions was applied. Using a new method, intermittent search field irradiation, evidence was found that the finite spin diffusion rate caused a double resonance energy transfer rate under continuous search field irradiation about 30% less than the transfer rate which would be observed if the spin diffusion were infinitely fast. A theoretical explanation of the results is given using a perturbation approach based on the concept of spin diffusion. In addition, we have studied the Na spin lattice relaxation in the completely demagnetized state as a function of impurity concentration, and found a rapid initial decrease of spin order. 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