HYDROGEN ATOM QUANTUM DIFFUSION-LIMITED REACTION KINETICS OF H + CO → HCO IN SOLID PARAHYDROGEN: UNEXPECTED RESULTS

Muddasser, Ibrahim

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Title

HYDROGEN ATOM QUANTUM DIFFUSION-LIMITED REACTION KINETICS OF H + CO → HCO IN SOLID PARAHYDROGEN: UNEXPECTED RESULTS

Author(s)

Muddasser, Ibrahim

Contributor(s)

• Anderson, David T.
• McDonald, Erin
• Nguyen, Anh H. M.

Issue Date

2023-06-21

Keyword(s)

Dynamics and kinetics

Abstract

Our group recently showed that the rate constant for the diffusion-limited H + N₂O reaction in solid parahydrogen (pH₂) is inversely related to the N₂O concentration.ᵃ This finding was rationalized by the idea that chemical impurities disrupt the long-range order of the crystal and slow the H-atom quantum diffusion rate. We investigated this finding further by studying the H + CO → HCO reaction in solid pH₂. To explore how the reaction rate constant depends on the CO concentration, we prepared solid pH₂ matrix samples co-doped with CO and Cl₂ using the Rapid Vapor Deposition technique,ᵇ H-atoms are produced in situ using a UV-IR method described previously.ᶜ We performed kinetic studies at 1.56(3) and 4.00(2)K with a range of CO concentrations (10 − 250 ppm). We observe a similar inverse relationship between the rate constant and the CO concentration. Furthermore, it looks like the rate constant decreases from 1.56(3) to 4.00(2)K. This work is ongoing, and the latest results and analysis will be presented at the meeting.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122375

DOI

https://doi.org/10.15278/isms.2023.6926

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