Larmor Frequency
Larmor Frequency The Larmor frequency and equation are named after the Irish physicist and mathematician Joseph Larmor (1857-1942). Protons and neutrons pair up in nuclei causing the cancellation of their individual angular momentum. All nuclei also have a spin; those with an odd number of protons and/or neutrons will have a property called a magnetic (dipole) moment. Magnetic moment is characterized by its alignment with an external magnetic field analogous to a small bar magnet. These particular nuclei are also called dipoles because they have two poles like the north and south pole of a bar magnet. H-1 and P-31 are examples of nuclei with an unpaired proton. N-14 is an example of a nucleus with both an unpaired proton and neutron. In addition to alignment of nuclei with a magnetic moment, application of an external magnetic field will produce a secondary spin or wobble ( precession ) of nuclei around the main or static magnetic field. The preces...

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