Perspective on "New developments in molecular orbital theory" - Roothaan CCJ (1951) Rev Mod Phys 23 : 69-89

This paper reviews the title article by Clemens Roothaan and the huge impac t that his paper has had in modern chemistry. In his paper Roothaan convert s the molecular Schodinger equation into a matrix equation by systematicall y introducing the linear combination of atomic orbitals-molecular orbital a pproximation and by invoking the variational principle.