Decoupling of Spin Decoherence Paths near Zero Magnetic Field

• DOI: 10.1021/acs.jpclett.1c03714
• Publication Date: 2021-12-28T12:39:38Z
• Authors: Sven Bodenstedt; Denis Moll; Stefan Glöggler; Morgan W. Mitchell; Michael C. D. Tayler
• Keywords: Hyperpolarization; Heteronuclear molecule; Hamiltonian (control theory); Free induction decay

We demonstrate a method to quantify and manipulate nuclear spin decoherence mechanisms that are active in zero ultralow magnetic fields. These include (i) nonadiabatic switching of quantization axis due residual background fields (ii) scalar pathways through-bond couplings between 1H heteronuclear species, such as 2H used partially an isotopic substitute for 1H. Under conditions free evolution, relaxation can significantly limit polarization lifetimes thus the scope resonance procedures near field. It is shown robust trains pulsed dc apply π flip angles one or multiple species may switch effective symmetry Hamiltonian, imposing decoupled coupled dynamic regimes on demand. The should broaden spectrum hyperpolarized biomedical contrast-agent compounds hyperpolarization