During 1925 Ralph Kronig, who presented the idea of electron spin some months before George Uhlenbeck and Samuel Goudsmit, was working as an assistant to Landé.
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After a second stay (1930-1931) in Columbus, Ohio, he decided to establish himself in the United States.
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A solution to this problem was suggested in early 1925 by George Uhlenbeck and Samuel Goudsmit, students of Paul Ehrenfest (who rejected the idea), and independently by Ralph Kronig, one of Landé's assistants.