Preparation of Nuclear Spin Singlet States using Spin-Lock Induced Crossing

Abstract

We introduce a broadly applicable technique to create nuclear spin singlet states in organic molecules and other many-atom systems. We employ a novel pulse sequence to produce a spin-lock induced crossing (SLIC) of the spin singlet and triplet energy levels, which enables triplet/singlet polarization transfer and singlet state preparation. We demonstrate the utility of the SLIC method by producing a long-lived nuclear spin singlet state on two strongly-coupled proton pairs in the tripeptide molecule phenylalanine-glycine-glycine dissolved in D2O, and by using SLIC to measure the J-couplings, chemical shift differences, and singlet lifetimes of the proton pairs. We show that SLIC is more efficient at creating nearly-equivalent nuclear spin singlet states than previous pulse sequence techniques, especially when triplet/singlet polarization transfer occurs on the same timescale as spin-lattice relaxation.

5 pages, 3 figures

References in corpus (4)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Nuclear spin pair coherence in diamond for atomic scale magnetometry
• Environment Assisted Metrology with Spin Qubit
• Dependence of nuclear spin singlet lifetimes on RF spin-locking power

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