Born Feb. 5, 1917, in Kumla. Swedish physical chemist. Member of the Royal Swedish Academy of Sciences (1946).
In 1937, Claesson graduated from the University of Uppsala. He subsequently joined the staff of the university; he became a professor in 1946 and director of the university’s Institute of Physical Chemistry in 1949. Claesson’s principal works deal with the kinetics of fast chemical reactions. He has studied the reactivity of many short-lived, aromatic, negatively charged radicals, and he has developed powerful systems for flash photolysis.
Claesson became a foreign member of the Academy of Sciences of the USSR in 1976.