Chemical reactions are commonly depicted as transitions from reactants to products. However, such reactions involve many molecules, and the individual molecules themselves undergo frequently-occurring structural changes as they transform from the reactants to the products.
New research employs shutter speed analogies to validate 55-year-old theory about chemical reaction ratesAs the observation interval lengthens—akin to slowing down a camera's shutter speed—the dances of the molecules overlap and emerge as a blur of frequent changes, masking the intricate ballet of atoms in motion. Credit: Yumi Teruya
The dendrogram of indistinguishability of the Claisen rearrangement of allyl vinyl ether. Each colored step indicates an observation where exact coarse-graining applies. Credit: Yutaka Nagahata The team identified key observation intervals at which different molecular shapes"blur together" and the system appears to become simpler. They created a"systematic diagram" that shows how the reaction process appears more and more simplified as the observation interval increases, eventually appearing as a one-step process at long observation intervals.
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