NMR in Magnetic Field of the Earth: Pre-Polarization of Nuclei with Alternating Magnetic Field

Abstract

The polarization of nuclei in the low static magnetic field B-0 with an alternating magnetic field B*(B* >> B-0) at a very low frequency f(m) (but f(m) >> 1/T-1, where T-1 is the spin-lattice relaxation time) has been investigated. The question of the optimization of the energy consumption during the pre-polarization is also considered. The possibilities of the method are illustrated by the observation of nuclear magnetic resonance signals from a few liquids.