•The NMR experiment measures a largenumber of spins derived
from a huge number of molecules. Therefore, we now look at the macroscopic bevaviour.
•The sum of the dipole moments of all nuclei is called magnetization. In equilibrium the spins of I=1/2 nuclei are either in the a or b-state and precess about the axis of the static magnetic field. However, their phases are not correlated.
•For each vector pointing in one direction of the
transverse plane a corresponding vector can be
found which points into the opposite direction:
•