PURE ROTATIONAL SPECTRA OF ETHOXY RADICAL

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

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
Language: eng
Handle URL: https://hdl.handle.net/2142/122465
DOI: https://doi.org/10.15278/isms.2023.6778