http://www.pnas.org/content/12/2/80.full.pdf+html
In a recent note Uhlenbeck and Goudsmit suggest that the fourth of the
quantum numbers proposed by Pauli to describe the quantum state of each
electron in an atom is to be associated with the angular moment of
rotation of the electron about its own axis.
In a recent article Pauli showed that it is possible to classify the
multiplet levels by assigning four quantum numbers, i.e., four degrees
of freedom, to each electron.
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