Portrait of James Franck
. Source. - Nobel Lectures, Physics 1922–1941 Transformations of Kinetic Energy of Free Electrons into Excitation Energy of Atoms by Impacts by James Franck
- Über Zusammenstöße zwischen Elektronen und den Molekülen des Quecksilberdampfes und die Ionisierungsspannung desselben by James Franck and Gustav Ludwig Hertz
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James Franck (1882–1964) was a German physicist who is best known for his work in atomic and molecular physics. He was awarded the Nobel Prize in Physics in 1925, alongside Gustav Hertz, for their experiments demonstrating the behavior of electrons in atoms, which contributed significantly to the understanding of quantum mechanics. Franck's most notable contribution was the Franck-Hertz experiment, which provided evidence for the quantized nature of atomic energy levels.