Superconducting magnet Precessing Free induction (cooled by liquid helium)nucleus decay Fourier transform Time Frequency pulse domain domain The radio frequency excitation pulse and resulting NMR signals are sent through cables between the probe coils in the magnet and the computer Radio frequency (Rf) generator and computer operating console Sample tube spins within the Fourier transformation of the signal probe coils in the hollow bore from the time domain to the frequency at the center of the magnet domain occurs at the computer console FIGURE 13.10 Diagram of a Fourier transform nuclear magnetic resonance spectrometer