‎"CONDON, EDWARD UHLER. - EXPLAINING THE COVALENT BOND.‎
‎Wave Mechanics and the Normal State of the Hydrogen Molecule.‎

‎Easton, PA., Mack printing Compagny, 1927. Royal8vo. Contemp. full cloth. Spine gilt and with gilt lettering. In: ""Proceedings of the National Academy of Sciences of the United States of America"", Vol. 13. IX,865 pp. (Entire volume offered). Condon's paper: pp. 466-470.‎

Reference : 48883

‎First printing of pioneering paper uniting chemistry with Quantum mechanics. Condon explains the chemical bond by means of the new wave mechanics. A wave function is formulated that involves the introduction of a pair of electrons (the hydrogen molecule) in an electron orbital that extends about two ore more atomic nuclei. Together with a paper by Heitler and London from the same year, this paper marks the beginning of a new era in chemistry as it explains the chemical bond in terms of the new physics.Henry M. Leicester ""Source Book in Chemistry 1900-1950"", pp. 151-156.The volume contains also Condon's paper. ""Coupling of electronic and nuclear Motions in Diatomic Molecules"", pp. 462-466.‎