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London: Macmillan, 1926. 1st Edition. FIRST EDITION, ORIGINAL WRAPS, OF THE 1ST ANNOUNCEMENT IN ENGLISH OF THE CONCEPT OF ‘INTRINSIC SPIN'' OF THE ELECTRON. While still students studying at Leiden under Paul Ehrenfest, two Dutch physicists, George Uhlenbeck and Samuel Goudsmit postulated that the electron must have an intrinsic angular momentum (‘spin') and therefore a magnetic moment because the electron is charged. Each electron, they argued, spins with an angular momentum of ½ Planck constant and carries a magnetic moment of one Bohr magneton" (Instituut-Lorentz, Leiden". Commentary by Bohr follows their paper. "In 1925, Pauli proposed the idea of a fourth quantum number for electrons as an attempt to explain the anomalous Zeeman effect and the Pauli exclusion principle, but did not provide a physical explanation for this new quantum number. Shortly thereafter, [the duo] introduced the concept of intrinsic electron spin to explain the angular momentum of the free electron and provide a…
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Spinning Electrons and the Structure of Spectra Nature 117 No. 2938 pp. 264-265, February 20, 1926 [FIRST EDITION, ORIGINAL JOURNAL ISSUE IN ORIGINAL WRAPPERS]
by Uhlenbeck, George; Goudsmit, Samuel
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