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Judd–Ofelt theory is a theory in physical chemistry describing the intensity of electron transitions within the 4f shell of rare-earth ions in solids and solutions.[1][2]

The theory was introduced independently in 1962 by Brian R. Judd of the University of California, Berkeley, and PhD candidate George S. Ofelt at Johns Hopkins University.[2] Their work was published in Physical Review and the Journal of Chemical Physics, respectively.[1][3] Judd and Ofelt did not meet, however, until 2003 at a workshop in Lądek-Zdrój, Poland.[1]

Judd and Ofelt's work was cited approximately 2000 times between 1962 and 2004.[1] Brian M. Walsh of NASA Langley places Judd and Ofelt's theory at the "forefront" of a 1960s revolution in spectroscopic research on rare earth ions.[2]
See also

Parity (physics)
Bert Broer
Otto Laporte
Giulio Racah
John Hasbrouck Van Vleck
Eugene Wigner
Brian Garner Wybourne


Walsh, Brian M. (June 2005). Judd–Ofelt Theory: Principles and Practices (slideshow). The International School of Atomic and Molecular Spectroscopy. Erice, Italy. Retrieved 2015-11-18.
Walsh, Brian M. "Chapter 21: Judd-Ofelt theory: Principles and practices". In Di Bartolo, B.; Forte, O. Advances in Spectroscopy for Lasers and Sensing. Springer Netherlands. pp. 403–433. Retrieved 18 November 2015.
Hehlen, Markus P.; Brik, Mikhail G.; Krämer, Karl W. (April 2013). "50th anniversary of the Judd–Ofelt theory: An experimentalist's view of the formalism and its application". Journal of Luminescence 136: 221–239. Bibcode:2013JLum..136..221H. doi:10.1016/j.jlumin.2012.10.035. Retrieved 18 November 2015.

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