Friedrich Hund

Friedrich Hund
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Name	Friedrich Hund
Birth date	4 February 1896
Birth place	Karlsruhe, Grand Duchy of Baden
Death date	31 March 1997
Death place	Göttingen, Lower Saxony
Nationality	German
Fields	Physics, Quantum Mechanics, Spectroscopy
Institutions	University of Göttingen, University of Leipzig, University of Rostock, University of Marburg, University of Jena, University of Frankfurt, University of Bonn
Alma mater	University of Freiburg, University of Göttingen, University of Munich
Doctoral advisor	Arnold Sommerfeld
Doctoral students	Hertha Sponer, Günther Ludwig, Gerhard Herzberg
Known for	Hund's rules, molecular orbital theory, Hund-Mulliken theory, tunneling, electronic configurations

Friedrich Hund Friedrich Hund was a German physicist known for foundational work in quantum mechanics, molecular spectroscopy, and electronic structure. His research contributed to the development of Hund's rules, molecular orbital theory, and tunneling concepts, influencing subsequent work in atomic physics, chemistry, and quantum chemistry. Hund's career spanned institutions across Europe and collaborations with prominent scientists of the twentieth century.

Early life and education

Hund was born in Karlsruhe during the Grand Duchy of Baden and grew up amid the cultural contexts of Baden (territory), German Empire, and later the Weimar Republic. He studied physics and mathematics at the University of Freiburg, the University of Göttingen, and the Ludwig Maximilian University of Munich, where he worked under the supervision of Arnold Sommerfeld. During his formative years he encountered leading figures including Max Born, Werner Heisenberg, Niels Bohr, and Paul Dirac, and he participated in the intellectual milieu of the Old Quantum Theory transitioning to modern quantum mechanics.

Scientific career and contributions

Hund held professorial and research positions at the University of Rostock, University of Jena, University of Leipzig, University of Marburg, Goethe University Frankfurt, University of Göttingen, and University of Bonn. He developed what became known as Hund's rules to predict ground-state term symbols for atoms, influencing interpretations by Irving Langmuir, Walter Heitler, and Lothar Nordheim. Hund made early contributions to molecular orbital theory that paralleled and complemented work by Robert S. Mulliken, Linus Pauling, and Ernest R. Davidson. His analyses of electronic configurations and exchange interactions informed studies by John C. Slater, Richard G. Woolley, and Douglas Hartree. Hund explored tunneling splitting in double-well potentials, linking to ideas used later by Lev Landau, Evgeny Lifshitz, and Ivar Waller in solid-state contexts. His collaborations and correspondences involved figures such as Max von Laue, Otto Stern, James Franck, and Hertha Sponer, and his theoretical methods were applied in spectroscopy by Gerhard Herzberg, Rudolf Ladenburg, and Friedrich Paschen.

Hund's work provided conceptual tools used by researchers in Quantum Chemistry, Atomic Physics, and Molecular Spectroscopy and underpinned later developments by C. A. Coulson, Per-Olov Löwdin, Theodore H. Maiman, and John Pople. His insights into term multiplicity, spin-coupling, and orbital occupancy influenced computational approaches associated with Hartree–Fock method, Configuration interaction, and perturbation treatments used by Lev Shcherbakov and Vladimir Fock.

Major works and publications

Hund authored numerous papers and monographs, including formal treatments of electronic terms, molecular orbitals, and quantum tunneling. Key publications appeared in journals and proceedings associated with Annalen der Physik, Zeitschrift für Physik, and the Proceedings of the Royal Society. His writings interacted with classic texts by Arnold Sommerfeld, Paul Dirac, Werner Heisenberg, Max Born, and Linus Pauling. Editions and collected works were disseminated through publishers linked to the Königlich-Sächsische Akademie der Wissenschaften and academic presses used by Springer Verlag and Wiley. Hund's theoretical papers were cited by contemporaries such as Robert Mulliken, John Slater, C. J. Davison, E. U. Condon, and later by computational chemists including Martin Karplus, Michael Levitt, and Arieh Warshel.

Awards, honors, and legacy

Hund received recognitions from institutions like the German Physical Society and academies including the Göttingen Academy of Sciences and Humanities and the Royal Society through references and honorary interactions. His name is commemorated in the term "Hund's rules" used in atomic and molecular spectroscopy texts by Herbert B. Callen, Charles Kittel, and Donald A. McQuarrie. Hund's influence extends to curricula at the University of Göttingen, Technische Universität München, University of Cambridge, Harvard University, and Massachusetts Institute of Technology, where his concepts are taught alongside work by Erwin Schrödinger, Paul Dirac, and Werner Heisenberg. Subsequent prizes, symposia, and lecture series on quantum chemistry and spectroscopy have invoked his legacy in forums of the International Union of Pure and Applied Physics and the European Physical Society.

Personal life and later years

Hund married and balanced family life with an extensive academic career; his interactions included exchanges with scientists such as Lise Meitner, Otto Hahn, Max Planck, Friedrich Hund (son is not linked) and colleagues at universities in Leipzig, Jena, and Göttingen. In later years he reflected on the history of quantum mechanics in correspondence with historians and physicists from institutions like the Max Planck Institute for the History of Science and the Institute for Advanced Study. Hund lived through the First World War, the Second World War, the Cold War, and the reunification period affecting German academia, and he died in Göttingen at the age of 101.

Category:German physicists Category:Quantum physicists Category:1896 births Category:1997 deaths