出典:Wikipedia
出典:『Wikipedia』 (2011/06/27 20:20 UTC 版)
In Fourier Transform NMR, free induction decay (FID) is the observable NMR signal generated by non-equilibrium nuclear spin magnetisation precessing about the magnetic field (conventionally along z). This non-equilibrium magnetisation can be induced, generally by applying a pulse of resonant radio-frequency close to the Larmor frequency of the nuclear spins.