Magnetic Resonance In A Variable Field

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saw01

31st May 2012 - 06:37 AM

my question has two parts

first: does nuclear magnetic resonance or electron spin resonance occur in an oscillating magnetic field?
if so how can we determine the energy associated with it?

second: I need a paper that treats the magnetic field in quantum electrodynamics (as virtual photons).

any links, texts or hints will be much appreciated

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