Douglas Hartree

Douglas Hartree
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Name	Douglas Hartree
Caption	Hartree in 1946
Birth date	27 March 1897
Birth place	Cambridge, England
Death date	12 February 1958
Death place	Cambridge, England
Fields	Physics, Applied mathematics
Workplaces	University of Manchester, University of Cambridge
Alma mater	University of Cambridge (St John's College)
Doctoral advisor	Ralph H. Fowler
Known for	Hartree–Fock method, Hartree atomic units, Differential analyser
Awards	FRS (1932), Royal Medal (1946)

Douglas Hartree. Douglas Rayner Hartree was a pioneering British physicist and applied mathematician whose work fundamentally shaped the development of computational science and quantum chemistry. He is best known for developing the Hartree–Fock method, a cornerstone of atomic physics and molecular orbital theory, and for his early, influential work on analog and digital computers. His career bridged theoretical physics and practical computation, leaving a lasting legacy in both numerical analysis and the study of atomic structure.

Early life and education

Born in Cambridge, he was the son of the engineer William Hartree. He was educated at Bedford School before entering St John's College, Cambridge in 1915. His studies at the University of Cambridge were interrupted by service during the First World War, where he worked on anti-aircraft ballistics. Returning to Cambridge after the war, he completed the Mathematical Tripos and began research in theoretical physics under the supervision of Ralph H. Fowler. His early work focused on applying perturbation theory to problems in atomic spectra, laying the groundwork for his later computational approaches.

Career and research

Hartree began his academic career as a lecturer at Manchester University in 1929, working in the department led by Lawrence Bragg. In 1937, he returned to Cambridge as a professor of theoretical physics. His research interests were exceptionally broad, encompassing ballistics, fluid dynamics, and the ionosphere. However, his most significant contributions were in quantum mechanics and numerical methods. He was a key figure in establishing computational physics as a distinct discipline, advocating for the use of machines to solve complex mathematical problems that were intractable by hand.

Hartree–Fock method

Hartree's most famous theoretical contribution is the self-consistent field method for approximating the wave function and energy of many-electron systems, later refined with Vladimir Fock to become the Hartree–Fock method. Developed in the late 1920s, this method provided the first practical way to calculate the properties of atoms and molecules from the principles of quantum mechanics without excessive simplification. The technique, which iteratively solves a set of integro-differential equations, became a foundational tool in quantum chemistry and condensed matter physics, enabling the work of later scientists like Clementi and John Pople.

Computational contributions

Hartree was a leading advocate for mechanical computation. In the 1930s, he famously brought the concept of the differential analyser, an advanced analog computer invented by Vannevar Bush at the MIT, to Britain. He supervised the construction of a machine at Manchester and later a more advanced model at Cambridge. He applied these computers to a vast range of problems, from calculating atomic orbitals to solving equations for the British military during the Second World War. After the war, he was an early adopter and developer of digital computers like the Manchester Mark 1, writing one of the first books on the subject, *Calculating Instruments and Machines*.

Awards and honors

Hartree received numerous accolades for his scientific work. He was elected a Fellow of the Royal Society in 1932. In 1946, he was awarded the Royal Medal of the Royal Society. He served as President of the Institute of Physics from 1954 to 1956. His international standing was recognized by memberships in the American Philosophical Society and the Royal Netherlands Academy of Arts and Sciences. The Hartree atomic units, a system of natural units widely used in atomic physics, and the Hartree–Fock method itself stand as enduring honors to his influence.

Personal life and legacy

Hartree married Elaine Charlton in 1923. He was known as a dedicated teacher and a humble, practical scientist who distrusted excessive abstraction. He died suddenly in Cambridge in 1958. His legacy is profound, bridging the gap between theoretical physics and the dawn of the computer age. The Hartree Centre, a high-performance computing facility at the STFC Daresbury Laboratory, is named in his honor. His pioneering work established the essential computational techniques that underpin modern materials science, quantum chemistry, and astrophysics.

Category:British physicists Category:Computational scientists Category:Fellows of the Royal Society