If #B_0 = 0#, what happens with the magnetic moments of protons in NMR?

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Answer 1 · 2015-08-09T21:20:38

Nothing happens to the magnetic moments of protons when #B_0=0#.

All #""^1"H"# isotopes have an intrinsic magnetic moment #"µ = 2.7927 nuclear magnetons"#.

This magnetic moment is always present, no matter what the environment of the proton is.

You may be thinking of the energies of the protons in a magnetic field, #B_0#.

In the presence of such a field, two spin states with different energies exist.

Each level corresponds to a magnetic quantum number, #m =±1/2#.

When #B_0 = 0#, the two spin states have the same energy, because there is no magnetic field to split their energy states.