Understanding Rabi's NMR Work: Comparing Molecular Beam and Stern Methods

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I learned that Rabi developed the molecular beam methods which o.stern introduced. But
o.stern's method is used to proving electron space quantization.Rabi's method is to measure the nuclear magnetic moments.I don't know the difference between these two methods .why one is to measure electron,the other is to measure nuclear. Thank you!
 
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nobody can help?
 
Maybe Rabi's own article is informative here:

http://prola.aps.org/abstract/PR/v49/i4/p324_1
 

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