(See Acid-base reaction theories.) He became Distinguished Professor of Physics and Chemistry in 1961 and continued in his studies of molecular structure and spectra, ranging from diatomic molecules to large complex aggregates. In 1981, Mulliken became a founding member of the World Cultural Council. In 1983, Mulliken received the Golden Plate Award of the American Academy of Achievement. He retired in 1985. His wife died in 1975. At the age of 90, Mulliken died of congestive heart failure at his daughter's home in Arlington, Virginia on October 31, 1986. His body was returned to Chicago for burial. See also Mulliken symbols Adiabatic electron transfer Bonding molecular orbital Delta bond Halogen bond Walsh diagram References External links R. Stephen Berry, Biographical Memoirs, Vol. 78: Robert Sanderson Mulliken, 1896-1986 (Washington, D.C.: The National Academy Press, 2000), pages 146–165. Available on-line at: http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/mulliken-robert.pdf . Key Participants: Robert Mulliken - Linus Pauling and the Nature of the Chemical Bond: A Documentary History Guide to the Robert S. Mulliken Papers 1908-1985 at the University of Chicago Special Collections Research Center Guide to the Robert S. Mulliken Scientific Offprints Collection ca. 1930s-1985 at the University of Chicago Special Collections Research Center 1896 births 1986 deaths 20th-century American physicists American Nobel laureates Harvard University alumni Foreign Members of the Royal Society Fellows of the American Physical Society Members of the International Academy of Quantum Molecular Science Massachusetts Institute of Technology School of Science alumni Nobel laureates in Chemistry People from Newburyport, Massachusetts American people of German descent American physical chemists University of Chicago alumni Members of the United States National Academy of Sciences Founding members of the World Cultural Council University of Chicago faculty New York University faculty