期刊
MOLECULAR PHYSICS
卷 117, 期 15-16, 页码 2128-2137出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2019.1594421
关键词
Branching ratio; cold collisions; merged beam; Penning ionisation; associative ionisation
资金
- Israel Science Foundation [1810/13]
- European Commission [EU-FP7-ERC-CoG 1485]
- Alexander von Humboldt foundation
In many chemical reactions with more than one possible outcome, the branching ratio is nearly constant over a wide range of collision energies. In barrierless systems governed by long-range interactions, however, the branching ratio is more sensitive to collision energy, and its dependence on it can be useful for better understanding the dynamics and reconstructing interaction potentials. Here we present the reaction rates of Penning and associative ionisation of metastable neon and helium with argon atoms. We obtain reaction rates in merge beam experiments, over a wide range of collision energies corresponding to that of room temperature, all the way down to a few millikelvins. We observe a change of two orders of magnitude in the branching ratio in the measured collision energy range and explain these changes using theoretical calculations. [GRAPHICS] .
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