Time evolution of spin singlet in static homogeneous exchange and magnetic fields

Spin transitions in time-dependent regular and random magnetic fields

We study the transition between Zeeman levels of an arbitrary spin placed into a regular time-dependent magnetic field and a random field with the Gaussian distribution. One component of the regular field changes its sign at some moment of time, whereas another component does not change substantially. The noise is assumed to be fast. In this assumption we find analytically the ensemble average ...

Beyond the T1 limit: singlet nuclear spin states in low magnetic fields.

Low-field nuclear spin singlet states may be used to store nuclear spin order in a room temperature liquid for a time much longer than the spin-lattice relaxation time constant T1. The low-field nuclear spin singlets are unaffected by intramolecular dipole-dipole relaxation, which is generally the predominant relaxation mechanism. We demonstrate storage of nuclear spin order for more than 10 ti...

The modeling of induced current density in eyes from static magnetic fields produce by MR scanner

Introduction: Staff and patient Movement in static magnetic field MRI scanner induces current density in the human tissues, so cause biologic effects in people. The aim of this study was the Modelling of current density induced by moving individual with different velocities in static magnetic field of magnetic resonance imaging. Materials and Methods: current ...

Spin-exchange interactions of spin-one bosons in optical lattices: Singlet, nematic, and dimerized phases

We consider insulating phases of cold spin-1 bosonic particles with antiferromagnetic interactions, such as Na, in optical lattices. We show that spin-exchange interactions give rise to several distinct phases, which differ in their spin correlations. In twoand three-dimensional lattices, insulating phases with an odd number of particles per site are always nematic. For insulating states with a...

MRI and Static Electric and Magnetic Fields