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EPR: Electron Paramagnetic Resonance (Read 1568 times)
Gerrit-Jan Linker
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EPR: Electron Paramagnetic Resonance
18.06.12 at 12:34:46
 
EPR: Electron Paramagnetic Resonance
 
Electron paramagnetic resonance (EPR) = Electron Spin Resonance (ESR) spectroscopy  
 
A technique for studying materials with unpaired electrons.
 
Analogous to NMR, but in EPR it is electron spins that are excited instead of the spins of atomic nuclei.
 
Enery levels of ms=-1/2 and ms=+1/2 electrons split up under an electric field. The energy difference is:
∆E=geμBB0
where  
μB=the bohr magneton
B0=the applied magnetic (B) field
ge=the g-factor or Landau factor. ge=2.0023 for a free electron. The g-factor can give information about a paramagnetic center's electronic structure.  
 
Good conductors can be separated from poor conductors from the asymmetry of the EPR line shape.
 
Source:
http://en.wikipedia.org/wiki/Electron_paramagnetic_resonance
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« Last Edit: 10.01.14 at 09:03:31 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
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