ERSITY 13.4NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY Precessing Free inducti 理工 Superconducting magnet (cooled by liquid helium)nucleus decay Fourier transfor R Time Freque 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
Sample Magnet ith variable Chart magnetic field B Pen Radio frequency Amplifier oscillator Copyright 2000 John Wiley and Sons, Inc: