小中大ΔE = hνo = hγBo/2π
where h is Planck’s constant. The resonant frequency, νo, is in the radio frequency range,
identical to the precession frequency (the Larmor frequency) predicted by the classical
model.
Nucleus Abundance (%) Sensitivity Frequency (MHz)
1H 100 1.0 200
13C 1.1 0.016 50
15N 0.37 0.001 20
19F 100 0.83 188
31P 100 0.066 81
57Fe 2.2 3.4 × 105 6.5