After his release from an American prisoner of war camp in 1946, Dehmelt returned to his study of physics at theUniversity of Göttingen, where he supported himself by repairing and bartering old, pre-war radio sets. He completed his master's thesis in 1948 and received his PhD in 1950, both from the University of Göttingen. He was then invited toDuke University as a postdoctoral associate, emigrating in 1952. Dehmelt became an assistant professor at theUniversity of Washington inSeattle, Washington in 1955, an associate professor in 1958, and a full professor in 1961.[6]
In 1955 he built his first electron impact tube inGeorge Volkoff's laboratory at theUniversity of British Columbia[7] and experimented on paramagnetic resonances in polarized atoms and free electrons. In the 1960s, Dehmelt and his students worked on spectroscopy of hydrogen and helium ions. The electron was finally isolated in 1973 with David Wineland, who continued work on trapped ions at NIST.
He created the firstgeonium atom in 1976, which he then used to measure precise magnetic moments of the electron and positron with R. S. Van Dyck into the 1980s, work that led to his Nobel prize. In 1979 Dehmelt led a team that took the first photo of a single atom. He continued work onion traps at theUniversity of Washington, until his retirement in October 2002.
