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Clemens C. J. Roothaan (August 29, 1918 – June 17, 2019) was a Dutch physicist and chemist known for his development of the self-consistent field theory of molecular structure.
, Clemens Carel Johannes Roothaan (Nijmegen, … Clemens Carel Johannes Roothaan (Nijmegen, 29 augustus 1918 – Chicago, 17 juni 2019) was een Nederlands-Amerikaans natuurkundige en informaticus. Roothaan studeerde elektrotechniek aan de TU Delft vanaf 1935. Gedurende de Tweede Wereldoorlog werd hij geïnterneerd als krijgsgevangene. Later werden hij en zijn broer wegens verzetsactiviteit opgesloten in het concentratiekamp Vught. Tijdens de opmars van de geallieerden werden op 5 september 1944 circa 500 gevangenen doodgeschoten en werden de overigen, onder wie de gebroeders Roothaan, overgebracht naar concentratiekamp Sachsenhausen. Tegen het einde van de oorlog werden zij op een dodenmars gestuurd waarbij circa een derde omkwam onder wie de broer van Roothaan. De doctoraalscriptie van Roothaan was afgewerkt in gevangenschap, en op 14 oktober 1945 bekwam hij alsnog zijn diploma van TU Delft. Hierna reisde hij naar de Verenigde Staten waar hij zijn doctoraat behaalde aan de University of Chicago onder Robert Mulliken. Hierna werd hij hoogleraar in de natuurkunde aan diezelfde universiteit. Zijn naam is verbonden aan de "Roothaan-vergelijkingen" voor het oplossen van de Hartree-Fock vergelijkingen in een eindige basisset, een grondsteen van de quantumchemie. Na zijn emeritaat, in 1988, werkte hij voor de laboratoria van Hewlett-Packard Laboratories in Palo Alto, California, waar hij betrokken was bij de ontwikkeling van de Itanium-processor. de ontwikkeling van de Itanium-processor.
, Clemens C. J. Roothaan, né le 29 août 1918 à Nimègue et mort le 17 juin 2019, est un physicien néerlandais.
, Clemens C. J. Roothaan (* 29. August 1918 in Nijmegen; † 17. Juni 2019) war ein niederländischer Physiker, Chemiker und Computer-Architekt.
, クレメンス・C・J・ローターン（Clemens C. J. Roothaan、1918年8月29日 – 2019年6月17日）は、オランダの物理学者・化学者であった。分子構造の自己無撞着場理論の開発で知られる。
, Clemens Roothaan (Nijmegen, Países Baixos, … Clemens Roothaan (Nijmegen, Países Baixos, 1918) é um físico e químico neerlandês, ficou conhecido por descobrir as equações de Roothaan. Concluiu sua tese de Ph.D. em 1950 com Robert Sanderson Mulliken da Universidade de Chicago em química computacional. Na tese ele concluiu que a Teoria dos orbitais moleculares estava incorreta e para comprovar sua teoria ele desenvolveu o que viria a ser chamado de equações de Roothaan. No mesmo ano ele fez parte do departamento de física da mesma universidade. Durante o período de 1962 a 1968 ele foi diretor do centro de computação da Universidade de Chicago e mais tarde foi professor de física e química. Desde 1988 ele tem sido funcionário dos laboratórios da Hewlett-Packard em Palo Alto, California, onde sua principal contribuição tem sido o desenvolvimento de rotinas matemáticas para o processador Itanium. Roothaan é membro da Academia Internacional de Ciências Moleculares Quânticas.acional de Ciências Moleculares Quânticas.
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Clemens C. J. Roothaan (August 29, 1918 – June 17, 2019) was a Dutch physicist and chemist known for his development of the self-consistent field theory of molecular structure.
, Clemens Carel Johannes Roothaan (Nijmegen, 29 augustus 1918 – Chicago, 17 juni 2019) was een Nederlands-Amerikaans natuurkundige en informaticus. Roothaan studeerde elektrotechniek aan de TU Delft vanaf 1935.
, Clemens Roothaan (Nijmegen, Países Baixos, … Clemens Roothaan (Nijmegen, Países Baixos, 1918) é um físico e químico neerlandês, ficou conhecido por descobrir as equações de Roothaan. Concluiu sua tese de Ph.D. em 1950 com Robert Sanderson Mulliken da Universidade de Chicago em química computacional. Na tese ele concluiu que a Teoria dos orbitais moleculares estava incorreta e para comprovar sua teoria ele desenvolveu o que viria a ser chamado de equações de Roothaan. No mesmo ano ele fez parte do departamento de física da mesma universidade. Durante o período de 1962 a 1968 ele foi diretor do centro de computação da Universidade de Chicago e mais tarde foi professor de física e química.s tarde foi professor de física e química.
, クレメンス・C・J・ローターン（Clemens C. J. Roothaan、1918年8月29日 – 2019年6月17日）は、オランダの物理学者・化学者であった。分子構造の自己無撞着場理論の開発で知られる。
, Clemens C. J. Roothaan, né le 29 août 1918 à Nimègue et mort le 17 juin 2019, est un physicien néerlandais.
, Clemens C. J. Roothaan (* 29. August 1918 in Nijmegen; † 17. Juni 2019) war ein niederländischer Physiker, Chemiker und Computer-Architekt.
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Clemens C. J. Roothaan
, Clemens Roothaan
, クレメンス・ローターン
|
