dc.contributor.author | Tan, Kong Ooi | |
dc.contributor.author | Griffin, Robert G | |
dc.date.accessioned | 2022-09-19T14:30:31Z | |
dc.date.available | 2022-09-19T14:30:31Z | |
dc.date.issued | 2022 | |
dc.identifier.uri | https://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.iso | en | |
dc.publisher | AIP Publishing | en_US |
dc.relation.isversionof | 10.1063/5.0091663 | en_US |
dc.rights | Creative Commons Attribution 4.0 International license | en_US |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_US |
dc.source | American Institute of Physics (AIP) | en_US |
dc.title | Observation of a four-spin solid effect | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Tan, Kong Ooi and Griffin, Robert G. 2022. "Observation of a four-spin solid effect." The Journal of Chemical Physics, 156 (17). | |
dc.contributor.department | Massachusetts Institute of Technology. Department of Chemistry | en_US |
dc.contributor.department | Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) | en_US |
dc.relation.journal | The Journal of Chemical Physics | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dc.date.updated | 2022-09-19T14:23:34Z | |
dspace.orderedauthors | Tan, KO; Griffin, RG | en_US |
dspace.date.submission | 2022-09-19T14:23:38Z | |
mit.journal.volume | 156 | en_US |
mit.journal.issue | 17 | en_US |
mit.license | PUBLISHER_CC | |
mit.metadata.status | Authority Work and Publication Information Needed | en_US |