Hans Frauenfelder

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Hans Frauenfelder
Born	(1922-07-28)July 28, 1922 Schaffhausen, Switzerland
Died	July 10, 2022(2022-07-10) (aged 99) Tesuque, New Mexico, U.S.
Citizenship	American
Alma mater	Swiss Federal Institute of Technology
Known for	Perturbed angular correlation protein folding and dynamics
Awards	Max Delbruck Prize (1992) Richtmyer Memorial Award (1981) Racah Lecture (1984) Guggenheim Fellowship (1958)
Scientific career
Fields	Physicist
Institutions	Los Alamos National Laboratory University of Illinois at Urbana-Champaign
Doctoral advisor	Paul Scherrer
Other academic advisors	Gregor Wentzel Wolfgang Pauli
Doctoral students	Harold Ralph Lewis

Hans Frauenfelder (July 28, 1922 – July 10, 2022) was an American physicist and biophysicist notable for his discovery of perturbed angular correlation (PAC) in 1951. In the modern day, PAC spectroscopy is widely used in the study of condensed matter physics. Within biophysics, he is known for his experimental and theoretical research on the dynamical behavior of protein tertiary structure.