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dc.contributor.authorTan, Kong Ooi
dc.contributor.authorGriffin, Robert G
dc.date.accessioned2022-09-19T14:30:31Z
dc.date.available2022-09-19T14:30:31Z
dc.date.issued2022
dc.identifier.urihttps://hdl.handle.net/1721.1/145489
dc.description.abstract<jats:p> The two-spin solid effect (2SSE) is one of the established continuous wave dynamic nuclear polarization mechanisms that enables enhancement of nuclear magnetic resonance signals. It functions via a state-mixing mechanism that mediates the excitation of forbidden transitions in an electron–nuclear spin system. Specifically, microwave irradiation at frequencies ω<jats:sub>μ w</jats:sub> ∼ ω<jats:sub>0S</jats:sub> ± ω<jats:sub>0I</jats:sub>, where ω<jats:sub>0S</jats:sub> and ω<jats:sub>0I</jats:sub> are electron and nuclear Larmor frequencies, respectively, yields enhanced nuclear spin polarization. Following the recent rediscovery of the three-spin solid effect (3SSE) [Tan et al., Sci. Adv. 5, eaax2743 (2019)], where the matching condition is given by ω<jats:sub>μ w</jats:sub> = ω<jats:sub>0S</jats:sub> ± 2 ω<jats:sub>0I</jats:sub>, we report here the first direct observation of the four-spin solid effect (4SSE) at ω<jats:sub>μ w</jats:sub> = ω<jats:sub>0S</jats:sub> ± 3 ω<jats:sub>0I</jats:sub>. The forbidden double- and quadruple-quantum transitions were observed in samples containing trityl radicals dispersed in a glycerol–water mixture at 0.35 T/15 MHz/9.8 GHz and 80 K. We present a derivation of the 4SSE effective Hamiltonian, matching conditions, and transition probabilities. Finally, we show that the experimental observations agree with the results from numerical simulations and analytical theory. </jats:p>en_US
dc.language.isoen
dc.publisherAIP Publishingen_US
dc.relation.isversionof10.1063/5.0091663en_US
dc.rightsCreative Commons Attribution 4.0 International licenseen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.sourceAmerican Institute of Physics (AIP)en_US
dc.titleObservation of a four-spin solid effecten_US
dc.typeArticleen_US
dc.identifier.citationTan, Kong Ooi and Griffin, Robert G. 2022. "Observation of a four-spin solid effect." The Journal of Chemical Physics, 156 (17).
dc.contributor.departmentMassachusetts Institute of Technology. Department of Chemistryen_US
dc.contributor.departmentFrancis Bitter Magnet Laboratory (Massachusetts Institute of Technology)en_US
dc.relation.journalThe Journal of Chemical Physicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2022-09-19T14:23:34Z
dspace.orderedauthorsTan, KO; Griffin, RGen_US
dspace.date.submission2022-09-19T14:23:38Z
mit.journal.volume156en_US
mit.journal.issue17en_US
mit.licensePUBLISHER_CC
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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