Cornelis Jacobus Gorter was an employee for whom after May 1946?
Cornelis Jacobus Gorter Cornelis Jacobus ( Cor ) Gorter ( 14 August 1907 , Utrecht – 30 March 1980 , Leiden ) was a Dutch experimental and theoretical physicist . Among other work , he discovered paramagnetic relaxation and was a pioneer in low temperature physics . Education and career . After his Abitur in The Hague , Gorter studied physics in Leiden , earning his PhD with the thesis Paramagnetische Eigenschaften von Salzen ( Paramagnetic Properties of Salts ) under Wander de Haas . From 1931 to 1936 he worked at Teylers Stichting in Haarlem and from 1936 to 1940 at the University of Groningen , before he became a professor at the University of Amsterdam as successor to Pieter Zeeman . In 1946 , succeeding W . H . Keesom , he returned to Leiden as a professor . In 1948 , as successor to De Haas , Gorter directed the Kamerlingh Onnes Laboratory , remaining there until his retirement in 1973 . He died in Leiden in 1980 , after suffering for several years from Alzheimers disease . His doctoral students include Nicolaas Bloembergen and Bert Broer . Work . In 1936 he discovered paramagnetic relaxation ; however , he missed the discovery of nuclear magnetic resonance ( otherwise known as nuclear spin resonance ) , as described by Joan Henri Van der Waals . With Hendrik Casimir he devised a two-fluid model to explain superconductivity with thermodynamics and Maxwells equations . Casimir described their collaboration in one of his books . The Gorter-model for a second-order phase transition is from this period of his career , as well as the elucidation of the Senftleben effect ( change of viscosity and thermal conductivity of paramagnetic gas in a magnetic field ) . Gorter studied many aspects of antiferromagnetism in CuCl·2HO . With Johannes Haantjes , he developed a theoretical model of antiferromagnetism in a double-lattice substance . After WWII he worked on liquid helium II and developed the theory which is now known as Coulomb blockade , the increase in electrical resistance in metal films at low temperatures . The Gorter-Mellink equation describes the mutual friction of two fluids in liquid helium II . Prizes and honors . - Membership of the Royal Netherlands Academy of Arts and Sciences in 1946 . - Fritz London Award in 1966 for his various contributions to the physics of low temperatures . His acceptance speech discusses the discoveries he missed . - In the autumn of 2007 , the C . J . Gorter Center for High-field MRI was opened in Leiden . Publications . - many scientific articles - book ( in Dutch ) Paramagnetische relaxatie , Leiden , November 1946 - Progress in Low Temperature Physics , six parts under his editorship Sources . - Biography - Biografie door H.A.M . Snelders in Biografisch Woordenboek van Nederland External links . - Oral History Transcript — Dr . C . J . Gorter , Niels Bohr Library & Archives with the Center for History of Physics of the American Institute of Physics