Siegbahn

He was one of three physicists awarded the Nobel Prize in 1981, along with Kai M. Siegbahn of Sweden and Arthur L. Schawlow of the United States.

In the presentation speech, Professor K. M. G. Siegbahn of the Royal Swedish Academy of Sciences praised the cyclotron as “without comparison, the most extensive and complicated apparatus construction carried out so far.”

Half of the physics prize will go to Kai Siegbahn, 63, of Sweden's Uppsala University, who follows in the footsteps of his late father Karl Siegbahn, the 1924 laureate in physics.*

Starting in the 1950s, Siegbahn developed a related analytic technique called electron spectroscopy.

Siegbahn overcame these difficulties by devising an ingenious new focusing device.