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State-Selected Reactivity of Carbon Dioxide Cations ( ) With Methane
Daniela Ascenzi1, Claire Romanzin2,3, Allan Lopes2
1Department of Physics, University of Trento, Trento, Italy.
Frontiers in Chemistry
|August 21, 2019
Summary
Investigating the reaction of deuterated methane (CD4) with vibrationally excited ions, this study finds that collision energy significantly impacts reactivity, while vibrational excitation has minimal effect. This research is crucial for plasma-based carbon-neutral fuel conversion.
Area of Science:
- Plasma Chemistry
- Chemical Kinetics
- Surface Science
Background:
- Non-equilibrium plasmas activate stable molecules like methane and carbon dioxide for synthesizing carbon-neutral fuels.
- Energy form (kinetic vs. internal excitation) can differentially influence chemical reaction pathways.
Purpose of the Study:
- To experimentally investigate the reactivity of vibrationally excited ions with methane (CD4).
- To understand the influence of kinetic energy versus vibrational excitation on ion-molecule reactions relevant to plasma chemistry.
Main Methods:
- Utilized a guided ion beam apparatus coupled with synchrotron radiation in the vacuum ultraviolet (VUV) energy range.
- Produced vibrationally excited ions to study their reactions with methane (CD4).
Main Results:
- Reactivity was found to be dependent on the collision energy of the reagent ions.
- Vibrational excitation of the ions showed a minor influence on the overall reactivity.
- Product branching ratios (CD3+ / CD2+ / DCO2+) were determined, with CD3+ being the dominant product.
Conclusions:
- Collision energy is a more significant factor than vibrational excitation in governing the reactivity of these ions with methane.
- The findings contribute to resolving discrepancies in literature values for product branching ratios in this reaction system.
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