Cold temperatures invert product ratios in Penning ionisation reactions with argon

Bibelnik N, Gersten S, Henson AB, Lavert-Ofir E, Shagam Y, Skomorowski W, Koch CP, Narevicius E (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Molecular Physics Taylor & Francis: STM, Behavioural Science and Public Health Titles / Taylor & Francis

Book Volume: 117

Pages Range: 2128-2137

Journal Issue: 15-16

DOI: 10.1080/00268976.2019.1594421

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.

Involved external institutions

Weizmann Institute of Science IL Israel (IL) Universität Kassel DE Germany (DE)

How to cite

APA:

Bibelnik, N., Gersten, S., Henson, A.B., Lavert-Ofir, E., Shagam, Y., Skomorowski, W.,... Narevicius, E. (2019). Cold temperatures invert product ratios in Penning ionisation reactions with argon. Molecular Physics, 117(15-16), 2128-2137. https://doi.org/10.1080/00268976.2019.1594421

MLA:

Bibelnik, Natan, et al. "Cold temperatures invert product ratios in Penning ionisation reactions with argon." Molecular Physics 117.15-16 (2019): 2128-2137.

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