HEISENBERG, W. (+) M. BORN.

Die Elektronenbahnen im angeregten Heliumatom.

[Berlin, Julius Springer, 1923]. 8vo. Extracted from "Zeitschrift für Physik. Hrsg. von Karl Scheel. 16. Band". No backstrip. Pp. 229-244.

First printing of this important paper in which Heisenberg and Born applied the quantum theory the helium atom.

Heiseberg arrived in Gottingen for the winter semester of 1922-1923, which gave a private assistantship with Born.
"Except for semester-long visits to Munich and Copenhagen. Heisenberg remained in Göttingen until May 1926. The period was one of his most productive scientifically. With his colleagues there, he developed the matrix form of quantum mechanics, progressed toward an interpretation of the new formalism, and applied the quantum theory, along with electron spin, to the Zeeman effect, the helium atom, and other old problems. In July 1924 Heisenberg qualified to teach on the university level by presenting to the Göttingen faculty a modification of the quantum rules for the Zeeman effect. The modification foreshadowed the notions of what Born was now calling a future "quantum mechanics." (DSB).

Order-nr.: 45686