Lennard-Jones, John

Bmsh, S. G. 1970. Lennard-Jones, John Edward. Dictionary of Scientific Biography 8 185-187. 

John Edward Lennard-Jones, British theoretical physical chemist (1994 1954). Fritz London, German Physicist (L900-1954). 

This was the chair of theoretical chemistry at Cambridge University held by John Lennard-Jones, who pursued a research agenda very different from Lespieau. Christopher Longuet-Higgins became professor of theoretical chemistry at Cambridge, succeeding Lennard-Jones, in 1954. 

N. F. Mott, "John Edward Lennard-Jones (18941954)," 175184, in Biographical Memoirs of the Royal Society, I (1955), on 111. 

Sir John Edward Lennard-Jones (1894—1954). 89 P. M. Gilbert ( ). 

Molecular orbital theory originated from the theoretical work of German physicist Friederich Hund (1896-1997) and its apphcation to the interpretation of the spectra of diatomic molecules by American physical chemist Robert S. MuUiken (1896-1986) (Hund, 1926, 1927a, b Mulliken, 1926, 1928a, b, 1932). Inspired by the success of Heitler and London s approach, Finklestein and Horowitz introduced the linear combination of atomic orbitals (LCAO) method for approximating the MOs (Finkelstein and Horowitz, 1928). The British physicist John Edward Lennard-Jones (1894-1954) later suggested that only valence electrons need be treated as delocalized inner electrons could be considered as remaining in atomic orbitals (Lennard-Jones, 1929). 

To those who began work in quantum chemistry in England after the war the scene was sparse. Sir John Lennard-Jones had returned to the Theoretical Chemistry... 

Table 7.2 Lennard-Jones potential parameters used in the simulations for assembling D4R units. Reproduced with permission of John Wiley Sons, Ltd and the American Chemical Society...

John Pople was bom in Bumham-on-Sea, Somerset in 1925, the son of a men s clothing storeowner. His parents considered education important and sent him to Bristol Grammar School. Here he developed an interest in mathematics and in 1943 went to Trinity College, Cambridge to read mathematics. As it was wartime he had to finish his degree in two years and in 1945 went to work for the Bristol Aeroplane Company. In 1947 he returned to Cambridge as a maths student but developed an interest in theoretical science. He went on to work with Sir John Lennard-Jones after whom one of the interatomic potentials used in calculations is named. At about the same time Pople decided to learn to play the piano and went on to marry his piano teacher, Joy Bowers. 

John Edward Lennard-Jones Cecil Day-Lewis... 

John Edward Lennard-Jones, bom Leigh, Lancaster, England, 1894. Ph.D. Cambridge, 1924. Professor Bristol. Best known for the Lennard-Jones potential function for nonbonded atoms. Died Stoke-on-Trent, Etmland, 1954. 

Sir John Edward Lennard-Jones, bom Oct. 27,1894, in Leigh, Lancashire, died Nov. 1, 1954, in Stoke-on-Trent, Staffordshire. 

In 1933,]. E. (John) Lennard-Jones became the John Humphrey Plummer Professor of Theoretical Chemistry at the University of Cambridge. During his tenure of the Chair, the Department showed great strength in calculational... 

Cavendish FHS had a chance to work with John E. Lennard-Jones in quantum mechanics, met Max Born who had also left Germany, and attended Bom s seminars. He regretted that he was unable to work with Peter Kapitza who had been at Cambridge with Rutherford for fourteen years but was spending his annual vacation in 1934 visiting relatives in the Soviet Union. Kapitza did not return to England, clearly not by his choice but due to Stalin s decree. 

Friedrich Hund, Peter Debye, Felix Bloch, Douglas Hartree, Eugene Wigner, Albert Einstein, Erich Huckel, Edward Teller, Nevil Mott, and John Lennard-Jones. The frequency of the appearance of his name in this book is the best testament to his great contribution to quantum chemistry. 

FIGURE 1.5. Chart showing correlation between effective pore size of various zeolites and Lennard-Jones kinetic diameter, The dotted portions indicate the range over which the cut-off occurs between low and high temperatures (77-420 K). (From ref. 19, copyright John Wiley Sons, Inc., reprinted with permission.)... 

Sir John Edward Lennard-Jones (1894—1954). British physicist. Although trained as a mathematician, Lennard-Jones s work on molecular structure and intermolecular forces helped lay the foundation of modern theoretical and computational chemistry. 

Lennard-Jones potential An expression used to represent the potential energy V of intermolecular interactions as a function of the intermolecular distance r. V can be written in the form V = -A/r + B/r, where A and B are constants. The Lennard-Jones potential has been used extensively to study intermolecular interactions. It was proposed by the British theoretical chemist Sir John Lennard-Jones in 1924. 

John E. Lennard-Jones (1894-1954), proJessor of theoretical chemistry of the University of Cambridge, UK. The reader may find a historic picture of the theoretical chemistry team in Intern. J. Quantum Chemistry, S23, XXXII (1989). 

Fig. 2.9. Trajectories of a particle which interacts with a center of force via a Lennard-Jones potential for various reduced impact parameters b = bla. As b increases from 0, the path changes from a head-on to a glancing collision. Plots are for different reduced collision energies, T = pclJle (a) 0.8, (b) 4, (c) 20, and (d) a hard-sphere potential. For the smaller b the trajectories are not greatly affected by changes in T although the deflection angle is energy dependent. For the larger b there are qualitative differences, most evident in (a), where T is the smallest. [Data from J. O. Hirschfelder, C. F. Curtiss, and R. B. Byrd, Molecular Theory of Gases and Liquids (New York John Wiley, 1954), pp. 1132-1146.]...

Htickel started his treatment by choosing the electronic configuration of the ground state of the oxygen molecule proposed by John Edward Lennard-Jones (1929), even though he knew about the alternative suggestion by Hund and Mulliken ... 

John Edward Lennard-Jones and His Molecular Fields... 

Lennard-Jones moved to Cambridge in 1932 and became the first Plummer Professor of Theoretical Chemistry. On November 7, 1931, at the bequest of J. H. Plummer, the John Humphrey Plummer Professorship of Inorganic Chemistry was established. In a meeting held on July 19, 1932, the search committee decided to offer the chair to Lennard-Jones, who had not even applied for the position, bypassing in this way nine can didates.Lennard-Jones accepted, and on December 19,1932, the title of the chair was changed Inorganic Chemistry was replaced by Theoretical Chemistry. It became the first such chair in Great Britain and in the world (Hall 1991, 5). 

Mott, N. R 1955. John Edward Lennard-Jones, 1894-1954. Biographical Memoirs of Fellows of the Royal Society. Royal Society (Great Britain) 1 175-184. 

Figure 1-4. Lennard-Jones model potential energy function. (Adapted with permission from reference 1. Copyright 1960, John Wiley and Sons.)...

In this chapter we examine more carefully the formation of the covalent bond. The description of molecules by quantum mechanics can become exceedingly complicated. The best compromise between simplicity and accuracy is probably the molecular orbital (MO) theory, developed about 1932 by Friedrich Hund, Robert Mulliken, Erich Hiickel, and John Lennard-Jones,... 

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