Leipzig, Ambrosius Barth, 1927. 8vo. In contemporary full cloth with gilt lettering to spine. In ""Annalen der Physik"", Vierte Folge, Band 84. Entire volume offered. Library labels pasted on the pasted down front free end paper. Traces after a label to lower part of spine. Stamp to title page. Internally fine and clean. Pp. 457-484. [Entire volume: 1080, VIII pp.].
First printing of Born and Oppenheimer's famous paper in which the Born-Oppenheimer approximation which is the computation of the energy and the wavefunction of an average-size molecule. It is still an indispensable part of quantum chemistry today.