Roothaan, Clemens

Rizhik Josif Moiseevich 357 Robb Michael 262,273 Roger Geard 3,46 Rohrmuth R.M.F. 70, 71 Roos Bjorn O. 533, 538 Roothaan Clemens CJ. 268, 328,364—366, 423, 453, 468, 471, 484, 494, 509, 510 Rosen Natan 3, 38, 39, 51, 54 Rosenbluth Arianna W. 312 Rosenbluth Marshal N. 278, 312 Ross Marvin 827 Rotkiewicz Krystyna 841 Le Roy Robert J. 284 Ruedenberg Klaus 176, 354, 398, 400, 401, 405,423 Runge Carl 76 Runge Erich 611 Ruoff Arthur L. 827 Rutherford Ernest 2, 7,8 Rutkowski Andrzej W. 119 Ruud Kenneth 678, 679 Rychlewski Jacek 509, 510,516 Rydberg Henrik 611... 

Douglas Rayner Hartree (1897-1958). Vladimir Aleksandrovich Fock (1898-1974). Clemens C. J. Roothaan (1918- ). 

Clemens C.J. Roothaan (b. 1918), American physicist and professor at the University of Chicago. He became interested in this topic after recognizing that in the literature, people write about the effective one-electron operator, but he could not find its mathematical expression. He derived the expression within the SCF LCAO MO procedure. 

Abstract. This paper reviews the title article by Clemens Roothaan and the huge impact that his paper has had in modern chemistry. In his paper Roothaan converts the molecular Schodinger equation into a matrix equation by systematically introducing the linear combination of atomic orbitals-molecular orbital approximation and by invoking the variational principle. 

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