Probing molecular mutual neutralization reactions of atmospheric importance using the ion storage facility DESIREE
ORAL · Invited
Abstract
The evolution of plasma environments is defined and governed by intricate balances between ionizing processes, chemical rearrangements, and neutralisation reactions such as mutual neutralisation (MN). Measuring and explaining these processes in detail is fundamental to understanding and modelling non-local thermal equilibrium (non-LTE) environments, such as atmospheric plasmas. Until recently, experimental studies of MN involving molecular ions in flow tubes and merged-beams were limited to measurements of overall reactivities without detailed data on mechanisms or final states. The Double ElectroStatic Ion Ring ExpEriment (DESIREE) facility [1-5], with its combination of stored and merged ion beams and coincident imaging detection, now makes such studies possible [6,7]. Here, we can control and manipulate the internal energies of the ions before they react, the ion-ion collision energy fine-tuned, and it is possible to identify reaction products and the states they are in. This opens possibilities to reach new insights into MN reaction pathways and their dynamics.
We aim for a better understanding of how molecules are formed and processed, where we combine novel experimental methods to build a fundamental picture of the transfer of charge-, energy- and mass in gas phase collisions. Here I focus on MN relevant to atmospheric non-LTE phenomenon such as sprites, looking at reactions involving molecular oxygen and nitrogen ions. Starting with O- + NO+ [6] and O- + O2+ to NO2- + NO+, I demonstrate the power of the techniques available at DESIREE to elucidate competition between two- and three-body product channels and unravel effects of rovibrational energy on the reaction.
[1] R. D. Thomas et al., Rev. Sci. Instrum. 82, 065112 (2011)
[2] H. T. Schmidt et al., Rev. Sci. Instrum. 84, 055115 (2013)
[3] H. T. Schmidt et al., Phys. Rev. Lett. 119, 073001 (2017)
[4] M. Poline et al., Phys. Chem. Chem. Phys. 23, 24607 (2021)
[5] M. Poline et al., Phys. Rev. A, 105, 062825 (2022)
[6] M. Poline et al., Phys. Rev. Lett. 132, 023001 (2024).
[7] A. Bogot et al., Science 383, 285 (2024).
We aim for a better understanding of how molecules are formed and processed, where we combine novel experimental methods to build a fundamental picture of the transfer of charge-, energy- and mass in gas phase collisions. Here I focus on MN relevant to atmospheric non-LTE phenomenon such as sprites, looking at reactions involving molecular oxygen and nitrogen ions. Starting with O- + NO+ [6] and O- + O2+ to NO2- + NO+, I demonstrate the power of the techniques available at DESIREE to elucidate competition between two- and three-body product channels and unravel effects of rovibrational energy on the reaction.
[1] R. D. Thomas et al., Rev. Sci. Instrum. 82, 065112 (2011)
[2] H. T. Schmidt et al., Rev. Sci. Instrum. 84, 055115 (2013)
[3] H. T. Schmidt et al., Phys. Rev. Lett. 119, 073001 (2017)
[4] M. Poline et al., Phys. Chem. Chem. Phys. 23, 24607 (2021)
[5] M. Poline et al., Phys. Rev. A, 105, 062825 (2022)
[6] M. Poline et al., Phys. Rev. Lett. 132, 023001 (2024).
[7] A. Bogot et al., Science 383, 285 (2024).
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Publication: M. Poline et al., Phys. Chem. Chem. Phys. 23, 24607 (2021)<br>M. Poline et al., Phys. Rev. A, 105, 062825 (2022)<br>M. Poline et al., Phys. Rev. Lett. 132, 023001 (2024).<br>A. Bogot et al., Science 383, 285 (2024).<br>M. Poline et al., under review at Nature Communications (2024).<br>M. Poline et al., in preparation
Presenters
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Richard D Thomas
Stockholm Univ
Authors
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Richard D Thomas
Stockholm Univ