FRANCK, J. und G. HERTZ. - THE FRANCK-HERTZ EXPERIMENTS, NOBEL PRIZE 1926.

Über Zusammenstösse zwischen Elektronen und den Molekülen des Quecksilberdampfes und die Ionisierungsspannung desselben. (+) ¨Uber die Erregung der Quicksilberresonanzlinie 256,6 (u u) durch Elektronenstösse.

Braunschweig, Friedr. Vieweg & Sohn, 1914. No wrappers. In: "Verhandlungen der deutschen Physikalischen Gesellschaft im Jahre 1914. Hrsg. von Karl Scheel", 16. jahrgang, Nr. 10 a. 11. Pp. (437-) 494 a. (495-) 566. (Entire issues offered). With titlepage to 16. Jahrgang. The papers: pp. 457-467 a. pp. 512-517, 2 textillustr.

First apperance of these two groundbreaking papers constituting the famous "Franck-Hertz Experiments" giving the first experimental determination of Planck's constant not using blackbody radiation.

"Thus, the experiments by Franck and hertz were later considered as a new and independent support not only of Planck's quantum theory and Einstein's light-quantum hypothesis, but also of Bohr's theory of the atom with sationary states of discrete energies. In 1926 Franck and Hertz were awardedthe Nobel prize for 1925."(Siegmund Brandt "The Harvest of a century", Episode 25, p. 102).

The Nobel Prize were given "for their discovery of the laws governing the impact of an electron upon an atom".

Order-nr.: 48162