Light is often used to trigger reactions, energetically exciting the reactant(s) to kick them over the intrinsic reaction barrier. Now, however, the reaction between an excited atom and a charged molecule at very low temperatures has been shown not to adhere to this paradigm, instead undergoing a reaction blockading effect.
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Wester, R. Too slow to be activated. Nat. Chem. 11, 600–601 (2019). https://doi.org/10.1038/s41557-019-0287-9
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DOI: https://doi.org/10.1038/s41557-019-0287-9
