Born 9 May 1927; died 6 Feb 2019 at age 91.

#German #physicist and #biochemist who shared (with Ronald Norrish and George Porter) the 1967 #NobelPrize in #Chemistry “for their studies of extremely fast chemical reactions, effected by disturbing the #equlibrium by means of very short pulses of #energy.”

In 1954, Eigen introduced the relaxation techniques for the study of extremely fast chemical reactions (those taking less than a #millisecond).

His general method was to take a solution in equilibrium for a given #temperature and #pressure. If a short disturbance was applied to the solution the equilibrium would be very briefly destroyed and a new equilibrium quickly reached. Eigen studied exactly what happened in this very short time by means of #absorption #spectroscopy.

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