Bones, DL orcid.org/0000-0003-1394-023X, Daly, SM orcid.org/0000-0001-7957-4514, Mangan, TP orcid.org/0000-0001-7053-5594 et al. (1 more author) (2020) A study of the reactions of Ni⁺ and NiO⁺ ions relevant to planetary upper atmospheres. Physical Chemistry Chemical Physics, 22 (16). pp. 8940-8951. ISSN 1463-9076
Abstract
The reactions between Ni+(2D) and O3, O2, N2, CO2 and H2O were studied at 294 K using the pulsed laser ablation at 532 nm of a nickel metal target in a fast flow tube, with mass spectrometric detection of Ni+ and NiO+. The rate coefficient for the reaction of Ni+ with O3 is k(294 K) = (9.7 ± 2.1) × 10−10 cm3 molecule−1 s−1; the reaction proceeds at the ion-permanent dipole enhanced Langevin capture rate with a predicted T−0.16 dependence. Electronic structure theory calculations were combined with Rice–Ramsperger–Kassel–Markus theory to extrapolate the measured recombination rate coefficients to the temperature and pressure conditions of planetary upper atmospheres. The following low-pressure limiting rate coefficients were obtained for T = 120–400 K and He bath gas (in cm6 molecule−2 s−1, uncertainty ±σ at 180 K): log10(k, Ni+ + N2) = −27.5009 + 1.0667log10(T) − 0.74741(log10(T))2, σ = 29%; log10(k, Ni+ + O2) = −27.8098 + 1.3065log10(T) − 0.81136(log10(T))2, σ = 32%; log10(k, Ni+ + CO2) = −29.805 + 4.2282log10(T) − 1.4303(log10(T))2, σ = 28%; log10(k, Ni+ + H2O) = −24.318 + 0.20448log10(T) − 0.66676(log10(T))2, σ = 28%). Other rate coefficients measured (at 294 K, in cm3 molecule−1 s−1) were: k(NiO+ + O) = (1.7 ± 1.2) × 10−10; k(NiO+ + CO) = (7.4 ± 1.3) × 10−11; k(NiO+ + O3) = (2.7 ± 1.0) × 10−10 with (29 ± 21)% forming Ni+ as opposed to NiO2+; k(NiO2+ + O3) = (2.9 ± 1.4) × 10−10, with (16 ± 9)% forming NiO+ as opposed to ONiO2+; and k(Ni+·N2 + O) = (7 ± 4) × 10−12. The chemistry of Ni+ and NiO+ in the upper atmospheres of Earth and Mars is then discussed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This journal is © the Owner Societies 2020. This is an author produced version of an article published in Physical Chemistry Chemical Physics. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/P001815/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Apr 2020 11:55 |
Last Modified: | 06 Apr 2021 00:38 |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | 10.1039/D0CP01124J |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:159196 |