Proton Nuclear Magnetic Resonance concept?
For NMR, is the applied external magnetic field kept constant throughout the whole test? or do we need to increase the magnetic field for different proton in different molecular environment to 'flip' to a higher energy level? I don really know the procedure of NMR.
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Not my field of expertise, but this might put you on the right path: http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear...
Good luck.