Issue 20, 2024

Electronic properties and collision cross sections of AgOkHm± (k, m = 1–4) aerosol ionic clusters

Abstract

Experimental evidence shows that hydroxylated metal ions are often produced during cluster synthesis by atmospheric pressure spark ablation. In this work, we predict the ground state equilibrium structures of AgOkHm± clusters (k and m = 1–4), which are readily produced when spark ablating Ag, using the coupled cluster with singles and doubles (CCSD) method. The stabilization energy of these clusters is calculated with respect to the dissociation channel having the lowest energy, by accounting perturbative triples corrections to the CCSD method. The interatomic interactions in each of the systems have been investigated using the frontier molecular orbital (FMO), natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) methods. Many of the ground states of these ionic clusters are found to be stable, corroborating experimental observations. We find that clusters having singlet spin states are more stable in terms of dissociation than the clusters that have doublet or triplet spin states. Our calculations also indicate a strong affinity of the ionic and neutral Ag atom towards water and hydroxyl radicals or ions. Many 3-center, 4-electron (3c/4e) hyperbonds giving rise to more than one resonance structure are identified primarily for the anionic clusters. The QTAIM analysis shows that the O–H and O–Ag bonds in the clusters of both polarities are respectively covalent and ionic. The FMO analysis indicates that the anionic clusters are more reactive than the cationic ones. Using the cluster structures predicted by the CCSD method, we calculate the collision cross sections of the AgOkHm± family, with k and m ranging from 1 to 4, by the trajectory method. In turn, we predict the electrical mobilities of these clusters when suspended in helium at atmospheric pressure and compare them with experimental measurements.

Graphical abstract: Electronic properties and collision cross sections of AgOkHm± (k, m = 1–4) aerosol ionic clusters

Supplementary files

Article information

Article type
Paper
Submitted
13 Nov 2023
Accepted
29 Apr 2024
First published
30 Apr 2024
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2024,26, 14547-14560

Electronic properties and collision cross sections of AgOkHm± (k, m = 1–4) aerosol ionic clusters

M. Doust Mohammadi, S. Bhowmick, A. Maisser, A. Schmidt-Ott and G. Biskos, Phys. Chem. Chem. Phys., 2024, 26, 14547 DOI: 10.1039/D3CP05499C

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