# What is the Landé g factor?

What is the Landé g factor?

I know that it gives the relation between magnetic moment and angular moment, but i wanted to know why are those magnitudes related to each other and why is the magnetic moment operator defined proportional to he angular moment and how is the gyromagnetic ratio calculated theoretically.

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I can't answer your question however the actual calculation of the g factor could be done via Wigner-Eckart theorem –  Jorge Nov 13 '12 at 22:04