James Franck writes up the Franck Report with the Committee on Political and Social Problems regarding the atomic bomb. This report reccommends not to use the atomic bombs on the Japanese cities, the authors of the report instead propose that the bomb be exploded in an uninhabited area to show its power to the Japanese government.
Franck und Hertz bombard mercury atoms with electrons and trace the energy changes of the collisions. Electrons with insufficient velocity bounce off the mercury atoms, but an electron with a higher velocities loses precisely 4.9 electronvolts of energy to an atom. If the electron has more than 4.9 volts of energy, the mercury atom still absorbs only that amount. This experiment proves Niels Bohr’s theory that an atom can absorb internal energy only in precise and definite amounts, or quanta.
Franck is appointed professor of physics at the University of Göttingen. He works on quantum physics with Max Born. In 1925, Franck projects a mechanism to explain his observations of the photochemical dissociation of iodine molecules. He finds that in any molecular system the transition from one energy state to another is so rapid that the nuclei of the atoms involved can be considered to be stationary during the transition. In 17 April 1933, he resignes as a personal protest against the Nazi regime.
James Franck serves as a volunteer in the German Army during World War I. He is seriously injured at the leg in 1917 in a gas attack and he is awarded the Iron Cross 1st Class. He is discharged from the Army on 25 November 1918, soon after the World War I was ended.
James Franck is appointed Director of the Chemistry Division of the Metallurgical Laboratory at the University of Chicago, the center of the Manhattan District's Project. He works in the fields of photochemistry and atomic physics on the determinations from molecular band spectra of the energy involved in the dissociation of molecules. In 1947, Franck is named Professor emeritus at the University of Chicago, but he goes on working as Head of the Photosynthesis Research Group until 1956.
James Franck is Speyer Professor at Johns Hopkins University.
James Franck becomes the Head of the Physics Division of the Kaiser Wilhelm Gesellschaft for Physical Chemistry, at that time under the chairmanship of Fritz Haber. Franck works on electron impact measurements. It is here that Franck meets Born.
James Franck receives the Nobel prize for Physics with Gustav Hertz "for their discovery of the laws governing the impact of an electron upon an atom".
James Franck is born in Hamburg to Jacob Franck, a German Jewish banker, and Rebecka Nachum Drucker.
James Franck attends Wilhelm Gymnasium.
James Franck becomes assistant of Heinrich Rubens at the Humboldt University of Berlin (formerly Frederick William University). There, he starts working with the physicist Gustav Hertz on a series of experiments that would provide direct proof of Bohr's theoretical model of quantised atomic structure. On on 20 May 1911, he obtains the "venia legendi" for physics to lecture.
James Franck works as guest Professor for a year at University of Copenaghen. He works with his assistant Hilde Levi, set to studying the fluorescence of green plants.
Hamburg had no university at that time, therefore James Franck enter the University of Heidelberg. He intends to study law and economics there but then he decides to switch to studying physics and chemistry. At Heidelberg Franck meets Niels Bohr, who would become a lifelong friend. Franck attends mathematics lectures by Leo Königsberger and Georg Cantor, but since Heidelberg University is not specialized in physical sciences, after only one year he decides to enter the Humboldt University of Berlin (formerly Frederick William University).
James Franck dies in Göttingen for hearh failure at the age of 83.
James Franck studies physics at the Humboldt University of Berlin (formerly Frederick William University) under Emil Warburg and Paul Drude. While there he tries to determine the mobility of ions using a method invented by Cambridge physicist Ernest Rutherford.
James Franck is appointed Professor of Physics at Johns Hopkins University.
James Franck works as assistant at University of Frankfurt. There, he continues exploring the forces between electrons and atoms.