John J. Hopfield (spectroscopist)

John Joseph Hopfield (8 August 1891 – 8 January 1953) was a Polish-American spectroscopist, discoverer of the Hopfield bands of oxygen and co-discoverer of the Lyman-Birge-Hopfield bands of nitrogen. Hopfield's major research pursuits included vacuum ultraviolet spectroscopy and solar ultraviolet spectroscopy. He was well known in these disciplines. Hopfield published frequently and produced several patents.[1]

By the time he left Berlin in 1929, the stock market crash and depression had ended most new faculty hiring. Purdue University appointed him as a National Research Council Fellow for two years. He next was employed in creating the physics exhibit for the 1933 ‘Century of Progress’ World’s Fair in Chicago, followed by a position with the Libby-Owens-Ford glass company in Toledo Ohio. With the onset of WWII, physicists were again in great demand, and he moved to Washington DC to participate in war-related research. The end of his career was spent at the Johns Hopkins Applied Physics Laboratory and at the Naval Research Laboratory in the Optics Division in Washington, D.C. On 8 January 1953, Hopfield died after a brief illness.

Select publications

Patents
  • HOPFIELD[9]
  • Manufacture of multiple glass sheet glazing units[10]
  • Uniting of glass to glass and metals to glass[11]
  • Multiple glass sheet glazing unit and method of making the same[12]
  • Multiply glass sheet glazing unit[13]
  • Method of fabricating multiple glass sheet glazing units[14]

References
  1. "John Simon Guggenheim Memorial Foundation". John Simon Guggenheim Memorial Foundation. Archived from the original on 6 August 2014. Retrieved 2 August 2014.
  2. Hopfield, J. J.; R. T. Birge (1927). "Ultraviolet Absorption and Emission Spectra of Carbon Monoxide". Physical Review. 29 (6): 922. Bibcode:1927PhRv...29..901.. doi:10.1103/PhysRev.29.901.
  3. Birge, R. T.; J. J. Hopfield (1928). "The Ultra-Violet Band Spectrum of Nitrogen". The Astrophysical Journal. 68: 257. Bibcode:1928ApJ....68..257B. doi:10.1086/143142.
  4. Hopfield, John J. (1930). "New Ultra-Violet Spectrum of Helium". The Astrophysical Journal. 72: 133. Bibcode:1930ApJ....72..133H. doi:10.1086/143271.
  5. Hopfield, John J. (1930). "Absorption and Emission Spectra in the Region λ 600-1100". Physical Review. 35 (9): 1133. Bibcode:1930PhRv...35.1133H. doi:10.1103/physrev.35.1133.
  6. Hopfield, J. J. (1930). "New Oxygen Spectra in the Ultraviolet and new Spectra in Nitrogen". Physical Review. 36 (4): 789–790. Bibcode:1930PhRv...36..783.. doi:10.1103/physrev.36.783.
  7. Hopfield, J. J.; E. T. S. Appleyard (1932). "A Simplified Method of Preparing Schumann Plates". JOSA. 22 (9): 488–495. doi:10.1364/josa.22.000488.
  8. Hopfield, J. J.; Clearman, H. E. (1948). "The Ultraviolet Spectrum of the Sun from V2 Rockets". Phys. Rev. 73 (9): 877–884. Bibcode:1948PhRv...73..877H. doi:10.1103/PhysRev.73.877.
  9. Hopfield, John J. (28 February 1933). HOPFIELD. Vol. U.S. Patent No. 1, 899, 804. Washington, D.C.: U.S. Patent and Trademark Office.
  10. Hopfield, John J. (3 September 1940). Manufacture of multiple glass sheet glazing units. Vol. U.S. Patent No. 2, 213, 395. Washington, D.C.: U.S. Patent and Trademark Office.
  11. Hopfield, John J. (14 January 1941). Uniting of glass to glass and metals to glass. Vol. U.S. Patent No. 2, 228, 352. Washington, D.C.: U.S. Patent and Trademark Office.
  12. Haven, Charles D.; John J. Hopfield (18 March 1941). Multiple glass sheet glazing unit and method of making the same. Vol. U.S. Patent No. 2, 235, 680. Washington, D.C.: U.S. Patent and Trademark Office.
  13. Haven, Charles D.; John J. Hopfield (18 March 1941). Multiple glass sheet glazing unit. Vol. U.S. Patent No. 2, 235, 681. Washington, D.C.: U.S. Patent and Trademark Office.
  14. Hopfield, John J. (14 December 1943). Method of fabricating multiple glass sheet glazing units. Vol. U.S. Patent No. 2, 336, 544. Washington, D.C.: U.S. Patent and Trademark Office.
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