Issue 32, 2023

Does HNO3 dissociate on gas-phase ice nanoparticles?


We investigated the dissociation of nitric acid on large water clusters (H2O)N, [N with combining macron] ≈ 30–500, i.e., ice nanoparticles with diameters of 1–3 nm, in a molecular beam. The (H2O)N clusters were doped with single HNO3 molecules in a pickup cell and probed by mass spectrometry after a low-energy (1.5–15 eV) electron attachment. The negative ion mass spectra provided direct evidence for HNO3 dissociation with the formation of NO3⋯H3O+ ion pairs, but over half of the observed cluster ions originated from non-dissociated HNO3 molecules. This behavior is in contrast with the complete dissociation of nitric acid on amorphous ice surfaces above 100 K. Thus, the proton transfer is significantly suppressed on nanometer-sized particles compared to macroscopic ice surfaces. This can have considerable implications for heterogeneous processes on atmospheric ice particles.

Graphical abstract: Does HNO3 dissociate on gas-phase ice nanoparticles?

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Article information

Article type
13 Jun 2023
11 Jul 2023
First published
11 Jul 2023
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2023,25, 21154-21161

Does HNO3 dissociate on gas-phase ice nanoparticles?

A. Khramchenkova, A. Pysanenko, J. Ďurana, B. Kocábková, M. Fárník and J. Lengyel, Phys. Chem. Chem. Phys., 2023, 25, 21154 DOI: 10.1039/D3CP02757K

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