Ion Momentum Imaging Study of the Ion-Molecule Charge Exchange Reaction of Ar+ + CO2

Chun-Xiao Wu; Jie Hu; Miao-Miao He; Shan Xi Tian

doi:10.1021/acs.jpca.9b06607

Ion Momentum Imaging Study of the Ion-Molecule Charge Exchange Reaction of Ar⁺ + CO₂

J Phys Chem A. 2019 Oct 10;123(40):8536-8541. doi: 10.1021/acs.jpca.9b06607. Epub 2019 Sep 13.

Authors

Chun-Xiao Wu¹, Jie Hu¹, Miao-Miao He¹, Shan Xi Tian¹

Affiliation

¹ Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei 230026 , China.

PMID: 31484476
DOI: 10.1021/acs.jpca.9b06607

Abstract

Three-dimensional ion momentum imaging is developed in a combination of ion velocity map imaging technique and delay-line anode ion detection, and it is applied for the ion-molecule charge exchange reaction between Ar⁺ and CO₂. In a center-of-mass collision energy range of 7.23-15.96 eV, CO₂⁺ products are primarily populated at the ground state X²Π_g and the single-electron excited states A²Π_u, B²Σ_u⁺, and C²Σ_g⁺; the multielectron excited states of CO₂⁺ are also found at the higher collision energies. The production efficiency profiles of CO₂⁺ are distinctly different from the photoionization electron spectrum of CO₂, implying that the charge transfer from Ar⁺ would be not fast as expected. The strong electron correlations in the short-lived intermediate (Ar-CO₂)⁺ should be responsible for the CO₂⁺ yields at the multielectron excited states.