[請益] about magnetic dipole

[jackypig (找我下象棋吧)]

The following is a context I've read in some electromagnetics reference book:

"According to a simplified atomic model, the electrons associated with a
particulatr nucleus orbit around the nucleus in circular paths while spinning
about themselves. In addition, the nucleus itself has a spin motion associated
with it. Since the movement of charge constitutes a current, these orbital and
spin motions are equivalent to current loops of atmoic dimensions. Thus, each
atom can be characterized by a superposition of magnetic dipole moments
corresponding to the electron orbital motions, electron spin motions, and the
nuclear spin."

I can understand that orbital motion of electron could be taken as a current
loop so that contribute to the magnetic dipole moment.

But why could the spin motions of electron and nucleus itself also have the
effects on the magnetic dipole moment?



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推 mathfeel:imagine a charged sphere spinning, there is an
→ mathfeel:associated magnetic moment.
→ mathfeel:In the case of electron/proton spin, it's really an
→ mathfeel:relativistic effect.
推 eddietu:the induction of magnetic dipole moment is from the
→ eddietu:self spin of electron
推 HLiNaKRbCsFr:Regarding to the last paragraph of your article,
→ HLiNaKRbCsFr:you might consult the relativistic quantum
→ HLiNaKRbCsFr:mechanics developed by Paul Dirac.
推 jackypig:relativistic quantum mechanics? for spin of nucleus?