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Nimrod Moiseyev

Cold temperatures invert product ratios in Penning ionisation reactions with argon

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Pages 2128-2137 | Received 31 Jul 2018, Accepted 06 Mar 2019, Published online: 24 Mar 2019
 

Abstract

In many chemical reactions with more than one possible outcome, the branching ratio, which is the ratio between the different reaction paths, 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.

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Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Israel Science Foundation: [Grant Number 1810/13]; The European Commission: [Grant Number EU-FP7-ERC-CoG 1485]; Alexander von Humboldt foundation.

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