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  Coherent evolution of signal amplification by reversible exchange in two alternating fields (alt-SABRE)

Pravdivtsev, A., Kempf, N., Plaumann, M., Bernarding, J., Scheffler, K., Hövener, J.-B., et al. (2021). Coherent evolution of signal amplification by reversible exchange in two alternating fields (alt-SABRE). ChemPhysChem, 22(23), 2381-2386. doi:10.1002/cphc.202100543.

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Pravdivtsev, AN, Author
Kempf, N1, 2, Author           
Plaumann, M, Author
Bernarding, J, Author
Scheffler, K1, 2, Author           
Hövener, J-B, Author
Buckenmaier, K1, 2, Author           
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Parahydrogen (pH 2 ) is a convenient and cost efficient source for magnetic resonance signal enhancement. Transient interaction of pH 2 with a metal organic complex in a signal amplification by reversible exchange (SABRE) experiment enabled more than 10% polarization for some 15 N molecules. Here, we analyzed a variant of SABRE, consisting of an outer magnetic field alternating between a low field of ~1 µT, where a polarization transfer takes place, and a higher field >50 µT (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 µT. The latter should be taken into consideration for an efficient alt-SABRE.

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 Dates: 2021-092021-12
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/cphc.202100543
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Title: ChemPhysChem
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley-VCH
Pages: - Volume / Issue: 22 (23) Sequence Number: - Start / End Page: 2381 - 2386 Identifier: ISSN: 1439-4235
CoNE: https://pure.mpg.de/cone/journals/resource/954925409790