4. Relaxation mechanisms

In most cases, relaxation results from the interaction between a core's magnetic moment and a fluctuating local magnetic field B _L (t).

Longitudinal (or spin-lattice) relaxation concerns the M _z component of magnetization. It is associated with an energy transfer with the lattice, a term that designates the entire environment of the nucleus under consideration. The fluctuating magnetic field B _L (t) has a role analogous to that of the coherent radio-frequency field B ₁ if the range of frequencies associated with the B _x , B _y components of B _L (t) satisfies...