Rudolph Arthur Marcus (July 21, 1923 – July 16, 2026) was a Canadian-born American chemist who received the 1992 Nobel Prize in Chemistry "for his contributions to the theory of electron transfer reactions in chemical systems". Marcus theory, named after him, provides a thermodynamic and kinetic framework for describing one electron outer-sphere electron transfer. He was a professor at Caltech, Nanyang Technological University, Singapore and a member of the International Academy of Quantum Molecular Science.
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