期刊
NATURE CHEMISTRY
卷 6, 期 4, 页码 332-335出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1857
关键词
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资金
- Israel Science Foundation
- Minerva Foundation
- United States National Science Foundation [CHE-1213332]
- Polish Ministry of Science and Higher Education
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1213332] Funding Source: National Science Foundation
Quantum phenomena in the translational motion of reactants, which are usually negligible at room temperature, can dominate reaction dynamics at low temperatures. In such cold conditions, even the weak centrifugal force is enough to create a potential barrier that keeps reactants separated. However, reactions may still proceed through tunnelling because, at low temperatures, wave-like properties become important. At certain de Broglie wavelengths, the colliding particles can become trapped in long-lived metastable scattering states, leading to sharp increases in the total reaction rate. Here, we show that these metastable states are responsible for a dramatic, order-of-magnitude-strong, quantum kinetic isotope effect by measuring the absolute Penning ionization reaction rates between hydrogen isotopologues and metastable helium down to 0.01 K. We demonstrate that measurements of a single isotope are insufficient to constrain ab initio calculations, making the kinetic isotope effect in the cold regime necessary to remove ambiguity among possible potential energy surfaces.
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