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Multiple Perspectives on the Stern-Gerlach Experiment

  • Tilman SauerEmail author
Chapter
Part of the Boston Studies in the Philosophy and History of Science book series (BSPS, volume 319)

Abstract

Different or conflicting accounts of the same episode in the history of science may arise from viewing that episode from different perspectives. The metaphor suggests that conflicting accounts can be seen as complementary, constructing a multi-dimensional understanding, if the different perspectives can be coordinated. As an example, I discuss different perspectives on the Stern-Gerlach experiment. In a static interpretation, the SGE has been viewed as an experiment that allows the determination of the magnetic moment of silver atoms. Based on the concept of magnetic momentum arising from orbital angular momentum, the original experiment was designed in 1922 as an experimentum crucis to decide between Bohr’s quantum theory and classical electromagnetic theory, and its outcome was interpreted as a confirmation of the Bohr-Sommerfeld quantum postulates. After the advent of quantum mechanics, the SGE was reinterpreted in terms of magnetic moment arising from the electron’s spin angular momentum. In a dynamical interpretation, physicists have asked for the physical mechanism responsible for the quantization of the angular momentum with respect to the direction of the magnetic field. Although different suggestions were explored, none was ever accepted as fully satisfactory. Today this difficulty is seen as a paradigmatic instance of the unsolved quantum measurement problem.

Keywords

Angular Momentum Wave Packet Silver Atom Magnetic Field Vector Inhomogeneous Magnetic Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

My understanding of the SGE effect has profited a lot from discussions with Horst Schmidt-Böcking and Wolfgang Trageser. I also thank Tim Räz, Raphael Scholl, and Adrian Wüthrich for helpful criticism of an earlier version of this paper.

References

  1. Bernstein, J. 2010. The Stern-Gerlach experiment. arXiv:1007.2435.
  2. Bohm, D. 1951. Quantum theory. Englewood Cliffs, NJ: Prentice-Hall.Google Scholar
  3. Einstein, A., and P. Ehrenfest. 1922. Quantentheoretische Bemerkungen zum Experiment von Stern und Gerlach. Zeitschrift für Physik 11:31–34. Reprinted in Kormos Buchwald et al., 2012, Doc. 315d.Google Scholar
  4. Friedrich, B., and D. Herschbach. 1998. Otto Stern’s lucky star. Daedalus 127(1): 165–191.Google Scholar
  5. Friedrich, B., and D. Herschbach. 2003. Stern and Gerlach: How a bad cigar helped reorient atomic physics. Physics Today 56(12): 53–59.CrossRefGoogle Scholar
  6. Friedrich, B., and D. Herschbach. 2005. Stern and Gerlach at Frankfurt: Experimental proof of space quantization. In Stern-Stunden. Höhepunkte Frankfurter Physik, ed. W. Trageser. Frankfurt: University of Frankfurt, Fachbereich Physik.Google Scholar
  7. Gerlach, W. 1969. Otto Stern zum Gedenken. Physikalische Blätter 25(9): 412–413.CrossRefGoogle Scholar
  8. Gerlach, W., and O. Stern. 1921. Der experimentelle Nachweis des magnetischen Moments des Silberatoms. Zeitschrift für Physik 8: 110–111.CrossRefGoogle Scholar
  9. Gerlach, W., and O. Stern. 1922a. Das magnetische Moment des Silberatoms. Zeitschrift für Physik 9: 353–355.CrossRefGoogle Scholar
  10. Gerlach, W., and O. Stern. 1922b. Der experimentelle Nachweis der Richtungsquantelung im Magnetfeld. Zeitschrift für Physik 9: 349–352.CrossRefGoogle Scholar
  11. Gerlach, W., and O. Stern. 1924. Über die Richtungsquantelung im Magnetfeld. Annalen der Physik 74: 673–699.CrossRefGoogle Scholar
  12. Kormos Buchwald, D., Illy, J., Rosenkranz, Z., and T. Sauer, T. (eds.). 2012. The Collected Papers of Albert Einstein, Vol. 13. The Berlin Years: Writings & Correspondence, January 1922–March 1923. Princeton: Princeton University Press.Google Scholar
  13. Mehra, J., and Rechenberg (eds.). 1982. The historical development of quantum theory, Vol. 1 in 2 parts. The quantum theory of Planck, Einstein and Sommerfeld: Its foundation and the rise of its difficulties 1900–1925. New York, Heidelberg, Berlin: Springer Verlag.Google Scholar
  14. Schmidt-Böcking, H., and K. Reich. 2011. Otto Stern. Physiker, Querdenker, Nobelpreisträger. Frankfurt/Main: Societäts-Verlag.Google Scholar
  15. Schmidt-Böcking, H., and W. Trageser. 2012. Ein fast vergessener Pionier. Physik Journal 11(3): 47–51.Google Scholar
  16. Schütz, W. 1969. Persönliche Erinnerungen an die Entdeckung des Stern-Gerlach-Effektes. Physikalische Blätter 25(8): 343–345.CrossRefGoogle Scholar
  17. Stern, O. 1921. Ein Weg zur experimentellen Prüfung der Richtungsquantelung. Zeitschrift für Physik 7: 249–253.CrossRefGoogle Scholar
  18. Toennies, J.P., H. Schmidt-Böcking, B. Friedrich, and J.C. Lower. 2011. Otto Stern (1888–1969): The founding father of experimental atomic physics. Annalen der Physik 523(12): 1045–1070.CrossRefGoogle Scholar
  19. Trageser, W. 2011. Der Stern-Gerlach-Effekt. Genese, Entwicklung und Rekonstruktion eines Grundexperimentes der Quantentheorie 1916–1926. Ph.D. Thesis, Johann Wolfgang Goethe-Universität Frankfurt.Google Scholar
  20. Unna, I., and T. Sauer. 2013. Einstein, Ehrenfest, and the quantum measurement problem. Annalen der Physik 525(1–2): A15–A19.CrossRefGoogle Scholar
  21. Weinert, F. 1995. Wrong theory—right experiment: The significance of the Stern-Gerlach experiments. Studies in the History and Philosophy of Modern Physics 26(1):75–86.Google Scholar

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Institute of MathematicsJohannes Gutenberg University MainzMainzGermany

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