The NMR Phenomenon: Precession

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Go to first Precession Q&A

Precession Q&A's

• All the NMR books all show protons precessing like little tops or gyroscopes within the magnetic field. I don't really understand why this type of motion should occur. Can you explain? 
• Who was Larmor and how did he discover his famous frequency?  
  
• Where does the energy come from to keep the precession going?
• What is meant by a chemical shift?   
  
• What is net magnetization and how does it apply to NMR?
  
• Does the net magnetization (M) just instantly appear?  
  
• I know that individual nuclei precess, but does the net magnetization (M) also?
• Is nuclear precession the same as resonance?   
  

Precession Topics

Angular frequency
Angular momentum
Chemical shift
Chemical shift tensor
Chemical shift anisotropy
Cyclic frequency
Diamagnetic susceptibility
Electron paramagnetic resonance
Gyromagnetic ratio

Inertia
Larmor equation
MR Spectroscopy
Net magnetization (M)
Parts per million (ppm)
Precession
Resonance
T1 relaxation time
Torque