Proof of the Doppler effect through canal rays and the splitting of spectral lines in electric fields

Johannes Stark (1874–1957, Germany)

Rationale for the award: “for his discovery of the Doppler effect in canal rays and the splitting of spectral lines in electric fields” (Stark-effect)

The German physicist discovered the optical Doppler effect in canal rays in 1905. He could prove experimentally Doppler’s hypothesis that the movement of a source of light affected the frequency it emitted.