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Transition state
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== History of concept == The concept of a transition state has been important in many theories of the rates at which [[chemical reaction]]s occur. This started with the [[transition state theory]] (also referred to as the activated complex theory), developed independently in 1935 by [[Henry Eyring (chemist)|Eyring]], [[Meredith Gwynne Evans|Evans]] and [[Michael Polanyi|Polanyi]], and introduced basic concepts in [[chemical kinetics]] that are still used today.<ref>{{cite web |title=Theories of reaction rates |url=https://www.britannica.com/science/chemical-kinetics/Theories-of-reaction-rates |website=Encyclopedia Britannica |access-date=30 January 2025}}</ref>
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