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Wikipedia states, that the spin degree of freedom was first formulated by Pauli in 1924:

In 1924 Wolfgang Pauli introduced what he called a "two-valued quantum degree of freedom" associated with the electron in the outermost shell.

However, there is no reference to this quote. Does someone know the publication where Pauli introduced this quantum number for the first time? The only paper I know this one, where he formulates his exclusion principle. But this is from 1925, so one year later.

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    $\begingroup$ There is a history-of-physics StackExchange. $\endgroup$ – Pieter Apr 5 '18 at 11:02
  • $\begingroup$ Oh thanks. Ok, so I think this question can be closed then. $\endgroup$ – thyme Apr 5 '18 at 11:06
  • $\begingroup$ @thyme It can be migrated, but I think a mod has to do that. $\endgroup$ – Martin C. Apr 5 '18 at 11:13
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Pauli himself talks about this here: https://www.bb.ustc.edu.cn/jpkc/xiaoji/lzlx/skja/35.pdf:

In the autumn of 1924 I published some arguments against this point of view, which I definitely rejected as incorrect and proposed instead of it the assumption of a new quantum theoretic property of the electron, which I called a « two-valuedness not describable classically »3.

However, the reference 3 is to a paper published in January 1925.

Reference W. Pauli, Z. Physik, 31 (1925) 765

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