Three-field NMR to preserve hyperpolarized proton magnetization as long-lived states in moderate magnetic fields

Abstract

This communication describes a three-field experiment where inequivalent scalar coupled spin pairs are hyperpolarized at 3.35T and 1.2K by dynamic nuclear polarization (DNP), rapidly transferred to high field (7T) to prepare a suitable initial condition that is converted adiabatically into a long-lived state (LLS) by shuttling to a ‘low’ magnetic field (2mT–7T). Even without applying any rf irradiation to sustain the LLS, it has a lifetime TLLS≫T1 in low fields. Finally, the sample is shuttled back to high field for observation under high-resolution conditions.