Coherent evolution of signal amplification by reversible exchange in two alternating fields (alt-SABRE)
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2021
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| _version_ | 1866909432450908160 |
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| author | Pravdivtsev, Andrey N. Kempf, Nicolas Plaumann, Markus Bernarding, Johannes Scheffler, Klaus Hövener, Jan-Bernd Buckenmaier, Kai |
| author_facet | Pravdivtsev, Andrey N. Kempf, Nicolas Plaumann, Markus Bernarding, Johannes Scheffler, Klaus Hövener, Jan-Bernd Buckenmaier, Kai |
| contents | Parahydrogen (pH2) is a convenient and cost efficient source for magnetic resonance signal enhancement. Transient interaction of pH2 with a metal organic complex in a signal amplification by reversible exchange (SABRE) experiment enabled more than 10% polarization for some 15N molecules. Here, we analyzed a variant of SABRE, consisting of an outer magnetic field alternating between a low field of ~1 \muT, where a polarization transfer takes place, and a higher field >50 \muT (alt-SABRE). We found effects of both of these fields on amplitude and the frequency of polarization transfer. Deviation of a lower magnetic field from a "perfect" condition of level anti-crossing increases the frequency of polarization transfer that can be exploited for polarization of short-lived transient SABRE complexes i.e. some substrates. Moreover, the coherences responsible for polarization transfer at a lower field persisted during magnetic field variation and continued their spin evolution at higher field with a frequency of 2.5 kHz at 54 \muT. The latter should be taken into consideration for an efficient alt-SABRE. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2107_09294 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Coherent evolution of signal amplification by reversible exchange in two alternating fields (alt-SABRE) Pravdivtsev, Andrey N. Kempf, Nicolas Plaumann, Markus Bernarding, Johannes Scheffler, Klaus Hövener, Jan-Bernd Buckenmaier, Kai Chemical Physics Parahydrogen (pH2) is a convenient and cost efficient source for magnetic resonance signal enhancement. Transient interaction of pH2 with a metal organic complex in a signal amplification by reversible exchange (SABRE) experiment enabled more than 10% polarization for some 15N molecules. Here, we analyzed a variant of SABRE, consisting of an outer magnetic field alternating between a low field of ~1 \muT, where a polarization transfer takes place, and a higher field >50 \muT (alt-SABRE). We found effects of both of these fields on amplitude and the frequency of polarization transfer. Deviation of a lower magnetic field from a "perfect" condition of level anti-crossing increases the frequency of polarization transfer that can be exploited for polarization of short-lived transient SABRE complexes i.e. some substrates. Moreover, the coherences responsible for polarization transfer at a lower field persisted during magnetic field variation and continued their spin evolution at higher field with a frequency of 2.5 kHz at 54 \muT. The latter should be taken into consideration for an efficient alt-SABRE. |
| title | Coherent evolution of signal amplification by reversible exchange in two alternating fields (alt-SABRE) |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2107.09294 |