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Kai Siegbahn

Swedish physicist
Kai Manne Börje Siegbahn was a Swedish physicist who shared the 1981 Nobel Prize in Physics. Wikipedia
Born: April 20, 1918, Lund, Sweden
Died: July 20, 2007 (age 89 years), Ängelholm, Sweden
Children: Per Siegbahn
Known for: X-ray photoemission spectroscopy