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- Clemens_C._J._Roothaan abstract "Clemens C.J. Roothaan (born in August 29, 1918 in Nijmegen) is a Dutch physicist.He enrolled TU Delft in 1935 to study electrical engineering. During World War II he was first detained as a prisoner of war camp. Later he and his brother were sent to the Vught concentration camp for involvement with the Dutch Resistance. On September 5, 1944, the remaining prisoners of the camp (including the Roothaan brothers) were moved to the Sachsenhausen camp in Germany ahead of the advancing Allies. Near the end of the war, the Sachsenhausen inmates were sent on a death march which Roothaan's brother did not survive.While a prisoner of war he was able to pursue his studies in physics together with other professors and students under the formal guidance of Philips. The work he was assigned to while cooperating with Philips was a foundation for his master's thesis. He obtained his master's degree in physics from TU Delft on October 14, 1945. After that he moved to USA, where he did his PhD thesis with Robert S. Mulliken from the University of Chicago, on semiempirical MO theory, while holding a post at The Catholic University of America in Washington, D.C.. He realised that the then current approach to molecular orbital theory was incorrect and changed his topic to what resulted in the development of the Roothaan equations. Prof. Mulliken mentions this work in his Nobel lecture as follows:I tried to induce Roothaan to do his Ph.D. thesis on Hückel-type calculations on substituted benzenes. But after carrying out some very good calculations on these he revolted against the Hückel method, threw his excellent calculations out the window, and for his thesis developed entirely independently his now well known all-electron LCAO SCF self-consistent-field method for the calculation of atomic and molecular wave functions, now appropriately referred to, I believe, as the Hartree–Fock-Roothaan method.He had moved to the University of Chicago in 1949 and his PhD was awarded in 1950. He then joined the Physics Department of the University of Chicago. From 1962 to 1968 he was Director of the University of Chicago Computation Centre. Later he was Professor of Physics and Chemistry at the University of Chicago. Since his retirement, in 1988, he has worked for the Hewlett-Packard Laboratories in Palo Alto, California, where his primary contribution has been in the development of the mathematical coprocessor routines for the Itanium chip. His method of analyzing pipeline architecture has been unique and innovative and greatly admired in supercomputer circles around the world.In 1982 Roothaan became a correspondent of the Royal Netherlands Academy of Arts and Sciences. He is a member of the International Academy of Quantum Molecular Science.".
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- Clemens_C._J._Roothaan wikiPageWikiLink Category:1918_births.
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- Clemens_C._J._Roothaan wikiPageWikiLink Category:Dutch_emigrants_to_the_United_States.
- Clemens_C._J._Roothaan wikiPageWikiLink Category:Dutch_physicists.
- Clemens_C._J._Roothaan wikiPageWikiLink Category:Guggenheim_Fellows.
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- Clemens_C._J._Roothaan wikiPageWikiLink Computational_chemistry.
- Clemens_C._J._Roothaan wikiPageWikiLink Death_march.
- Clemens_C._J._Roothaan wikiPageWikiLink Delft_University_of_Technology.
- Clemens_C._J._Roothaan wikiPageWikiLink Electrical_engineering.
- Clemens_C._J._Roothaan wikiPageWikiLink Hewlett-Packard.
- Clemens_C._J._Roothaan wikiPageWikiLink International_Academy_of_Quantum_Molecular_Science.
- Clemens_C._J._Roothaan wikiPageWikiLink Internment.
- Clemens_C._J._Roothaan wikiPageWikiLink Itanium.
- Clemens_C._J._Roothaan wikiPageWikiLink Molecular_orbital_theory.
- Clemens_C._J._Roothaan wikiPageWikiLink Netherlands.
- Clemens_C._J._Roothaan wikiPageWikiLink Nijmegen.
- Clemens_C._J._Roothaan wikiPageWikiLink Palo_Alto,_California.
- Clemens_C._J._Roothaan wikiPageWikiLink Philips.
- Clemens_C._J._Roothaan wikiPageWikiLink Robert_S._Mulliken.
- Clemens_C._J._Roothaan wikiPageWikiLink Roothaan_equations.
- Clemens_C._J._Roothaan wikiPageWikiLink Royal_Netherlands_Academy_of_Arts_and_Sciences.
- Clemens_C._J._Roothaan wikiPageWikiLink Sachsenhausen_concentration_camp.
- Clemens_C._J._Roothaan wikiPageWikiLink University_of_Chicago.
- Clemens_C._J._Roothaan wikiPageWikiLink Vught.
- Clemens_C._J._Roothaan wikiPageWikiLinkText "C. C. J. Roothaan".
- Clemens_C._J._Roothaan wikiPageWikiLinkText "Clemens C. J. Roothaan".
- Clemens_C._J._Roothaan wikiPageWikiLinkText "Clemens Roothaan".
- Clemens_C._J._Roothaan subject Category:1918_births.
- Clemens_C._J._Roothaan subject Category:Catholic_University_of_America_faculty.
- Clemens_C._J._Roothaan subject Category:Delft_University_of_Technology_alumni.
- Clemens_C._J._Roothaan subject Category:Dutch_emigrants_to_the_United_States.
- Clemens_C._J._Roothaan subject Category:Dutch_physicists.
- Clemens_C._J._Roothaan subject Category:Guggenheim_Fellows.
- Clemens_C._J._Roothaan subject Category:International_Academy_of_Quantum_Molecular_Science_members.
- Clemens_C._J._Roothaan subject Category:Living_people.
- Clemens_C._J._Roothaan subject Category:Members_of_the_Royal_Netherlands_Academy_of_Arts_and_Sciences.
- Clemens_C._J._Roothaan subject Category:People_from_Nijmegen.
- Clemens_C._J._Roothaan subject Category:Theoretical_chemists.
- Clemens_C._J._Roothaan subject Category:University_of_Chicago_alumni.
- Clemens_C._J._Roothaan subject Category:University_of_Chicago_faculty.
- Clemens_C._J._Roothaan hypernym Physicist.
- Clemens_C._J._Roothaan type List.
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- Clemens_C._J._Roothaan type Scientist.
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- Clemens_C._J._Roothaan type Member.
- Clemens_C._J._Roothaan type Redirect.
- Clemens_C._J._Roothaan type Scientist.
- Clemens_C._J._Roothaan comment "Clemens C.J. Roothaan (born in August 29, 1918 in Nijmegen) is a Dutch physicist.He enrolled TU Delft in 1935 to study electrical engineering. During World War II he was first detained as a prisoner of war camp. Later he and his brother were sent to the Vught concentration camp for involvement with the Dutch Resistance. On September 5, 1944, the remaining prisoners of the camp (including the Roothaan brothers) were moved to the Sachsenhausen camp in Germany ahead of the advancing Allies.".
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