Robust conversion of singlet spin order in coupled spin-1/2 pairs by adiabatically switched RF-fields

Abstract

We propose a robust and highly efficient NMR technique to create singlet spin order from longitudinal spin magnetization in coupled spin-1/2 pairs and to perform backward conversion (singlet order)$\to$magnetization. In this method we exploit adiabatic switching of an RF-field in order to drive transitions between the singlet state and the $T_{\pm }$ triplet states of a spin pair under study. We demonstrate that the method works perfectly for both strongly and weakly coupled spin pairs, providing a conversion efficiency between the singlet spin order and magnetization, which is equal to the theoretical maximum. We anticipate that the proposed technique is useful for generating long-lived singlet order, for preserving spin hyperpolarization and for assessing singlet spin order in nearly equivalent spin pairs in specially designed molecules and in low-field NMR studies.

arXiv comment21 pages, 11 figures

References in corpus (3)

• Preparation of Nuclear Spin Singlet States using Spin-Lock Induced Crossing
• Spin lock composite and shaped pulses for efficient and robust pumping of dark states in magnetic resonance
• Dependence of nuclear spin singlet lifetimes on RF spin-locking power

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• Long-Lived Singlet State in an Oriented Phase and its Survival across the Phase Transition Into an Isotropic Phase
• Symmetry-Based Singlet-Triplet Excitation in Solution Nuclear Magnetic Resonance
• Quantum Alternating Operator Ansatz for the Preparation and Detection of Long-Lived Singlet States in NMR
• Polychromatic Excitation of Delocalized Long-Lived Proton Spin States in Aliphatic Chains
• NMR of ${}^{31}$P Nuclear Spin Singlet States in Organic Diphosphates