Solid State Proton Imaging Detected by Quadrupole Resonance

Proton resonance for oscillating field of the order of static magnetic field

“…However NMR experiments at low fields are more common nowadays and the condition H 2 $ H o is more easily achieved (for example when H o is of the order of tens of Gauss or lower). In fact, some effects, induced by the rf field intensity, have been observed at low static external magnetic fields ($40 G), in Double Nuclear Resonance experiment in solids [3] and in solid state proton imaging detected by NQR [4]. In these experiments H 2 $ H o and it becomes important to know the correct resonance frequency to set the spin decoupling experiment properly.…”