University of Illinois Urbana-Champaign

PURE ROTATIONAL SPECTRA OF ETHOXY RADICAL

Chang, Ching Hua

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6778.pdf
TI02_1.pptx

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https://hdl.handle.net/2142/122465

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Title
PURE ROTATIONAL SPECTRA OF ETHOXY RADICAL
Author(s)
Chang, Ching Hua
Contributor(s)
Endo, Yasuki
Issue Date
2023-06-20
Keyword(s)
Radicals
Abstract
The ethoxy radical (C₂H₅O) is a reactive intermediate exciting in many important combustion and atmospheric reactions. The near-UV electronic transitions of ethoxy radical were studied by Tan et al. in 1993, where the rotational and spin-rotation splittings were resolved.ᵃ In the present study, the rotational spectra of C₂H₅O are measured by Fourier-transform Microwave (FTMW) and FTMW-microwave double-resonance spectroscopy in the frequency region of 4-40 GHz. The electric discharge of diluted ethanol is used to generate the ethoxy radical. Four a-type transitions and two b-type transitions including Kₐ = 0 and Kₐ = 1 are observed. The 2₀₂-1₀₁ and 1₁₀-1₀₁ transitions are reproduced with the double resonance technique. The rotational and spin-rotation coupling constants agree with Tan et al.’s results. However, the hyperfine splittings due to the five protons in the C H₅O radical are so complicated that definite assignment has not been obtained yet. We are trying to assign them with the help of the double resonance spectra.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122465
DOI
https://doi.org/10.15278/isms.2023.6778

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Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY