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Bond-forming and electron-transfer reactivity between Ar2+ and O2.

Sam Armenta Butt1, Stephen D Price1

  • 1Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK. s.d.price@ucl.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|April 9, 2020
PubMed
Summary

This study investigated argon dimer ion (Ar2+) reactions with oxygen (O2), revealing four product channels. The most intense channel involves Ar+ and O+ formation, with evidence of a short-lived collision complex.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Atomic and Molecular Collisions

Background:

  • Understanding ion-molecule reactions is crucial for various fields, including plasma physics and atmospheric chemistry.
  • The reactivity of doubly charged argon ions (Ar2+) with neutral molecules like oxygen (O2) presents complex reaction dynamics.
  • Previous studies have explored similar systems, but detailed insights into the reaction mechanisms and intermediates are often limited.

Purpose of the Study:

  • To elucidate the reactivity, energetics, and dynamics of bimolecular reactions between Ar2+ and O2.
  • To identify and characterize the different product ion channels formed during these collisions.
  • To investigate the role of collision complexes and reaction intermediates in the observed reaction pathways.

Main Methods:

  • Employed a position-sensitive coincidence methodology to study the reactions.
  • Investigated collisions at a specific energy of 4.4 eV.
  • Analyzed the mass and momentum of product ions to determine reaction channels and dynamics.

Main Results:

  • Observed four distinct bimolecular reaction channels: Ar+ + O2+, Ar+ + O+, ArO+ + O+, and O+ + O+.
  • The Ar+ + O+ + O channel was the most intense, with evidence for a short-lived [ArO2]2+ collision complex.
  • Identified direct O- abstraction as the mechanism for ArO+ formation, likely in an excited electronic state.

Conclusions:

  • The reaction between Ar2+ and O2 proceeds through multiple pathways, including single electron transfer, O- abstraction, and dissociative double electron transfer.
  • The formation of a transient [ArO2]2+ complex plays a significant role in the dominant Ar+ + O+ + O channel.
  • The study provides detailed insights into the complex dynamics and energetics governing these ion-molecule interactions.