Dependence of nuclear spin singlet lifetimes on RF spin-locking power

Details Dependence of nuclear spin singlet lifetimes on RF spin-locking power Dependence of nuclear spin singlet lifetimes on RF spin-locking power

2012-01-06

arxiv.org/abs/1201.1482v1

Physics

Chemical Physics

Scientific paper

We measure the lifetime of long-lived nuclear spin singlet states as a function of the strength of the RF spin-locking field and present a simple theoretical model that agrees well with our measurements, including the low-RF-power regime. We also measure the lifetime of a long-lived coherence between singlet and triplet states that does not require a spin-locking field for preservation. Our results indicate that for many molecules, singlet states can be created using weak RF spin-locking fields: more than two orders of magnitude lower RF power than in previous studies. Our findings suggest that in many biomolecules, singlets and related states with enhanced lifetimes might be achievable in vivo with safe levels of RF power.

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