An Introduction to the Electronic Structure of Atoms and MoleculesProfessor of Chemistry / McMaster University / Hamilton, Ontario

1.

The electrostatic method used in this book for the interpretation of chemical binding is based on the HellmannFeynman theorem. The theorem was proposed independently by both H. Hellmann and R. P. Feynman. Feynman's account of the theorem anticipates many of the applications to chemistry including the electrostatic interpretation of van der Waals forces. R. P. Feynman, Phys. Rev. 56, 340 (1939). 
2.  The wave functions used in the calculation of the density distributions for H_{2} were determined by G. Das and A. C. Wahl, J. Chem. Phys. 44, 87 (1966). These wave functions include configuration interaction and hence provide suitable descriptions for the H_{2} systems for large values of the internuclear separation. The wave functions for He_{2} are from N. R. Kestner, J. Chem. Phys. 48, 252 (1968). 


