Coherent Evolution of Signal Amplification by Reversible Exchange in Two Alternating Fields (alt-SABRE).

ABSTRACT: Parahydrogen (pH₂ ) is a convenient and cost-efficient source of spin order to enhance the magnetic resonance signal. Previous work showed that 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 ¹⁵ N molecules. Here, we analyzed a variant of SABRE, consisting of a magnetic field alternating between a low field of ∼1 μT, where polarization transfer is expected to take place, and a higher field >50 μT (alt-SABRE). These magnetic fields affected the amplitude and 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

SUBMITTER: Pravdivtsev AN 

PROVIDER: S-EPMC9292956 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature