Physical Chemistry Third Edition

24

Magnetic Resonance Spectroscopy

PRINCIPAL FACTS AND IDEAS

1. Magnetic fields can be produced by electric currents and moving
   charges.


2. Magnetic dipoles can be produced by currents flowing in loops and by
   rotating charges.


3. Electrons and nuclei with nonzero spins have magnetic dipoles.


4. Different spin states have different energies in a magnetic field.


5. Magnetic resonance spectroscopy involves transitions between spin
   states that have different energies in a magnetic field.


6. Electron spin resonance spectroscopy uses transitions between the two
   spin states of unpaired electrons in a magnetic field.


7. Nuclear magnetic resonance spectroscopy uses transitions between spin
   states of nuclei in a magnetic field.


8. Modern infrared and nuclear magnetic resonance (NMR) spectrometers
   use Fourier transform techniques.


9. Two-dimensional NMR spectra can provide additional information
   about molecular structure.

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