Mechanism of spontaneous polarization transfer in high-field SABRE experiments
We propose an explanation of the previously reported SABRE (Signal Amplification By
Reversible Exchange) effect at high magnetic fields, observed in the absence of RF-
excitation and relying only on “spontaneous” polarization transfer from parahydrogen (pH 2,
the H 2 molecule in its nuclear singlet spin state) to a SABRE substrate. We propose a
detailed mechanism for spontaneous polarization transfer and show that it is comprised of
three steps:(i) Generation of the anti-phase I ̂ 1 z I ̂ 2 z spin order of catalyst-bound H 2;(ii) …
Reversible Exchange) effect at high magnetic fields, observed in the absence of RF-
excitation and relying only on “spontaneous” polarization transfer from parahydrogen (pH 2,
the H 2 molecule in its nuclear singlet spin state) to a SABRE substrate. We propose a
detailed mechanism for spontaneous polarization transfer and show that it is comprised of
three steps:(i) Generation of the anti-phase I ̂ 1 z I ̂ 2 z spin order of catalyst-bound H 2;(ii) …
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