Table of Contents
Atoms, Volume 7, Issue 3 (September 2019) – 34 articles
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Cover Story (view full-size image) Quantum interference between the direct and looping reaction pathways determines the outcome of the [...] Read more. Quantum interference between the direct and looping reaction pathways determines the outcome of the ultracold O + OH → H + O2 reaction. In the ultracold regime, the interference can approach its maximal constructive or destructive values, effectively turning the reaction on or off (a quantum switch!). This is due to the unique properties of ultracold collisions, where the scattering phase shifts approach integer multiples of π (the integer corresponds to the number of bound states supported along each pathway). The geometric phase associated with the C2v conical intersection introduces an additional π-phase shift between the two interfering pathways, which reverses the nature of the interference (constructive ↔ destructive) and in this way controls the reaction. View this paper.