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Nobel Prizes and Laureates

Nobel Prizes and Laureates

The Nobel Prize in Physics 1981
Nicolaas Bloembergen, Arthur L. Schawlow, Kai M. Siegbahn

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Kai M. Siegbahn - Facts

Kai M. Siegbahn

Kai M. Siegbahn

Born: 20 April 1918, Lund, Sweden

Died: 20 July 2007, Ängelholm, Sweden

Affiliation at the time of the award: Uppsala University, Uppsala, Sweden

Prize motivation: "for his contribution to the development of high-resolution electron spectroscopy"

Field: atomic physics

Prize share: 1/2

Work

According to quantum physics principles, the electrons in atoms and molecules have defined energy levels. Albert Einstein's theory of the "photoelectric effect" says that a light particle (photon) can liberate an electron from an atom if it has sufficient energy. In the 1950s Kai Siegbahn developed methods for achieving highly accurate measurements of energy levels in atoms by irradiating them with photons and measuring the energy of the electrons emitted using the photoelectric effect.

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