A free induction decay (FID) curve is generated as excited nuclei relax in an NMR machine. The nuclei in an NMR are in a generated magnetic field when an RF pulse is transmitted to them. The pulse flips their magnetic moment into the XY plane where they spin at the Larmor frequency, this spinning of magnetic moments generates a current which is reflected in the FID. The FID is then Fourier Transformed in order to create the spectrum. NMR may refer to: Nuclear magnetic resonance, a phenomenon involving the interaction of atomic nuclei and external magnetic fields Nielsen Media Research, a U.S. company which measures TV, radio and newspaper audiences This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the... Current flowing through a wire produces a magnetic field (M) around the wire. ... In physics, the magnetic moment of an object is a vector relating the aligning torque in a magnetic field experienced by the object to the field vector itself. ... The Larmor equation in physics, named for Irish physicist Joseph Larmor, is ω = γ B The equation describes the relationship between the angular frequency ω of a precessing proton, and the strength of the magnetic field B. Here γ is the gyromagnetic ratio, a constant unique to the nucleus of...