Observation of a four-spin solid effect
<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 elec...
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| Format: | Article |
| Language: | English |
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AIP Publishing
2022
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| Online Access: | https://hdl.handle.net/1721.1/145489 |
| _version_ | 1811076091678294016 |
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| author | Tan, Kong Ooi Griffin, Robert G |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry Tan, Kong Ooi Griffin, Robert G |
| author_sort | Tan, Kong Ooi |
| collection | MIT |
| description | <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> |
| first_indexed | 2024-09-23T10:15:59Z |
| format | Article |
| id | mit-1721.1/145489 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:15:59Z |
| publishDate | 2022 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1454892022-09-30T20:01:29Z Observation of a four-spin solid effect Tan, Kong Ooi Griffin, Robert G Massachusetts Institute of Technology. Department of Chemistry Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) <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> 2022-09-19T14:30:31Z 2022-09-19T14:30:31Z 2022 2022-09-19T14:23:34Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/145489 Tan, Kong Ooi and Griffin, Robert G. 2022. "Observation of a four-spin solid effect." The Journal of Chemical Physics, 156 (17). en 10.1063/5.0091663 The Journal of Chemical Physics Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf AIP Publishing American Institute of Physics (AIP) |
| spellingShingle | Tan, Kong Ooi Griffin, Robert G Observation of a four-spin solid effect |
| title | Observation of a four-spin solid effect |
| title_full | Observation of a four-spin solid effect |
| title_fullStr | Observation of a four-spin solid effect |
| title_full_unstemmed | Observation of a four-spin solid effect |
| title_short | Observation of a four-spin solid effect |
| title_sort | observation of a four spin solid effect |
| url | https://hdl.handle.net/1721.1/145489 |
| work_keys_str_mv | AT tankongooi observationofafourspinsolideffect AT griffinrobertg observationofafourspinsolideffect |