The Reaction of Sulfur Dioxide Radical Cation with Hydrogen and its Relevance in Solar Geoengineering Models

Satta, Mauro; Cartoni, Antonella; Catone, Daniele; Castrovilli, Mattea Carmen; Bolognesi, P.; Zema, N.; Avaldi, L.

doi:10.1002/cphc.202000194

Cited by 8 publications

(12 citation statements)

References 89 publications

(103 reference statements)

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“…The discharge lamp was operated with a gas pressure in the discharge chamber that varies from 10 −1 to 10 −3 mbar, depending on the rare gas, and a driving current of 5 mA. The main lines, 45 in the three used gases, are at 21.22 eV (He I), 16.67 eV (Ne I), and 11.62 eV (Ar I). The output radiation is not monochromatized; hence, an unknown contribution of wavelengths different from the main lines listed above cannot be excluded.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…However, also ion chemistry plays a role in environmental processes. Indeed, ions produced by human activity or natural events (i.e., corona discharge, lightning, high voltage power lines, hot surfaces, and cosmic rays) quickly react with the surrounding molecules and produce new ionic and neutral species, in turn involved in the atmospheric reactivity. − It is also clear that charged species are involved in aerosol formation and can affect the Earth’s climate . It is therefore fundamental to understand the link between ion and neutral chemistry.…”

Section: Introductionmentioning

confidence: 99%

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VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation

et al. 2020

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Dihalomethanes XCH 2 Y (X and Y = F, Cl, Br, and I) are a class of compounds involved in several processes leading to the release of halogen atoms, ozone consumption, and aerosol particle formation. Neutral dihalomethanes have been largely studied, but chemical physics properties and processes involving their radical ions, like the pathways of their decomposition, have not been completely investigated. In this work the photodissociation dynamics of the ClCH 2 I molecule has been explored in the photon energy range 9–21 eV using both VUV rare gas discharge lamps and synchrotron radiation. The experiments show that, among the different fragment ions, CH 2 I + and CH 2 Cl + , which correspond to the Cl- and I-losses, respectively, play a dominant role. The experimental ionization energy of ClCH 2 I and the appearance energies of the CH 2 I + and CH 2 Cl + ions are in agreement with the theoretical results obtained at the MP2/CCSD(T) level of theory. Computational investigations have been also performed to study the isomerization of geminal [ClCH 2 I] •+ into the iso-chloroiodomethane isomers: [CH 2 I–Cl] •+ and [CH 2 Cl–I] •+ .

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation

et al. 2020

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“…The radical cation SO2 •+ that can be formed by ionizing radiation in the upper atmosphere, could produce species that should be taken into account in the models when this molecule is present. [27] Moreover, the non-thermal effects should be also considered, especially when SO2 •+ , excited in ro-vibrational levels of the ionic ground state after photon excitation with synchrotron radiation, reacts with a rigid molecule such as H2:…”

Section: So2/h2mentioning

confidence: 99%

Section: So2/h2mentioning

confidence: 99%

Perspectives of Gas Phase Ion Chemistry: Spectroscopy and Modeling

et al. 2022

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The study of ions in the gas phase has a long history and has involved both chemists and physicists. The interplay of their competences with the use of very sophisticated commercial and/or homemade instrumentations and theoretical models has improved the knowledge of thermodynamics and kinetics of many chemical reactions, even if still many stages of these processes need to be fully understood. The new technologies and the novel free-electron laser facilities based on plasma acceleration open new opportunities to investigate the chemical reactions in some unrevealed fundamental aspects. The synchrotron light source can be put beside the FELs, and by mass spectrometric techniques and spectroscopies coupled with versatile ion sources it is possible to really change the state of the art of the ion chemistry in different areas such as atmospheric and astro chemistry, plasma chemistry, biophysics, and interstellar medium (ISM). In this manuscript we review the works performed by a joint combination of the experimental studies of ion–molecule reactions with synchrotron radiation and theoretical models adapted and developed to the experimental evidence. The review concludes with the perspectives of ion–molecule reactions by using FEL instrumentations as well as pump probe measurements and the initial attempt in the development of more realistic theoretical models for the prospective improvement of our predictive capability.

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“…Specific theoretical models have been developed to describe nonstatistical reactions, and adaptations of statistical theories are of fundamental importance to explain specific experimental reactions. 25 , 26 , 17 …”

Section: Introductionmentioning

confidence: 99%

Ion Chemistry of Carbon Dioxide in Nonthermal Reaction with Molecular Hydrogen

et al. 2022

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The exothermic hydrogen transfer from H 2 to CO 2 · + leading to H and HCO 2 + is investigated in a combined experimental and theoretical work. The experimental mass/charge ratios of the ionic product (HCO 2 + ) and the ionic reactant (CO 2 · + ) are recorded as a function of the photoionization energy of the synchrotron radiation. Theoretical density functional calculations and variational transition state theory are employed and adapted to analyze the energetic and the kinetics of the reaction, which turns out to be barrierless and with nonthermal rate coefficients controlled by nonstatistical processes. This study aims to understand the mechanisms and energetics that drive the reactivity of the elementary reaction of CO 2 · + with H 2 in different processes.

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The Reaction of Sulfur Dioxide Radical Cation with Hydrogen and its Relevance in Solar Geoengineering Models

Cited by 8 publications

References 89 publications

VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation

VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation

Perspectives of Gas Phase Ion Chemistry: Spectroscopy and Modeling

Ion Chemistry of Carbon Dioxide in Nonthermal Reaction with Molecular Hydrogen

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The Reaction of Sulfur Dioxide Radical Cation with Hydrogen and its Relevance in Solar Geoengineering Models

Cited by 8 publications

References 89 publications

VUV Photofragmentation of Chloroiodomethane: The Iso-CH2I–Cl and Iso-CH2Cl–I Radical Cation Formation

VUV Photofragmentation of Chloroiodomethane: The Iso-CH2I–Cl and Iso-CH2Cl–I Radical Cation Formation

Perspectives of Gas Phase Ion Chemistry: Spectroscopy and Modeling

Ion Chemistry of Carbon Dioxide in Nonthermal Reaction with Molecular Hydrogen

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Product

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VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation

VUV Photofragmentation of Chloroiodomethane: The Iso-CH₂I–Cl and Iso-CH₂Cl–I Radical Cation Formation