B1 off…
(or off-resonance)
Mo
z
x
B1
z
x
Mxy
y
y
w1
w1
Right-hand rule
resonant condition:
frequency (w1) of B1 matches Larmor frequency (wo)
energy is absorbed and population of
a
and b states are perturbed.
An NMR
Experiment
And/Or:
Mo now precesses
about B1 (similar to Bo) for as long as the B1 field is applied.
Again, keep in mind that individual spins flipped up or down
(a single quanta), but Mo can have a continuous
variation.