ERSITY 13.4NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY Superconducting magnet Precessing Free induction (cooled by liquid helium) ucleus decay Fourier transf R Frequen pulse domain domain The radio frequency excitation pulse and resulting NMR signals are sent through cables betwe the probe coils in the magnet and the computer Radio frequency (rf generator and compute 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 B Magnet with variable Chart magnetic field B 0 Pen Radio frequency Amplifier oscillator Copyright 2000 John wiley and Sons, Inc