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High-Resolution Spectroscopic Investigation of the CH2CHO Radical in the Sub-Millimeter Region
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2024-01-05 , DOI: 10.1021/acs.jpca.3c06326
Rosemonde Chahbazian 1 , Marie-Aline Martin-Drumel 1 , Olivier Pirali 1
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2024-01-05 , DOI: 10.1021/acs.jpca.3c06326
Rosemonde Chahbazian 1 , Marie-Aline Martin-Drumel 1 , Olivier Pirali 1
Affiliation
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In this work, the pure rotational spectrum of the vinoxy radical (CH2CHO) has been studied at millimeter and sub-millimeter wavelengths (110–860 GHz). CH2CHO was produced by H-abstraction from acetaldehyde (CH3CHO) using atomic fluorine in a double-pass absorption cell at room temperature. A Zeeman-modulation spectrometer, in which an external magnetic field generated inside the absorption cell is amplitude-modulated, was used to record the pure rotational transitions of the radical. The recorded spectra are devoid of signals from closed-shell species, allowing for relatively fast acquisitions over wide spectral windows. Transitions involving values of the rotational quantum numbers N″ and Ka″ up to 41 and 18, respectively, were measured and combined with all available high-resolution literature data (both pure rotation and ground-state combination differences from ro-vibration) to greatly improve the modeling of the CH2CHO spectrum. The combined experimental line list is fit using a semirigid rotor Hamiltonian, and the results are compared to quantum chemical calculations. This laboratory study provides the spectroscopic information needed to search for CH2CHO in various interstellar environments, from cold (e.g., typically 10 K for dense molecular clouds) to warm (e.g., ∼200 K for hot corinos) objects.
中文翻译:
亚毫米区域 CH2CHO 自由基的高分辨率光谱研究
在这项工作中,在毫米和亚毫米波长 (110–860 GHz) 下研究了乙烯氧基 (CH 2 CHO) 的纯旋转光谱。 CH 2 CHO 是通过在室温下在双程吸收池中使用原子氟从乙醛 (CH 3 CHO) 中提取 H 来产生的。塞曼调制光谱仪对吸收池内产生的外部磁场进行幅度调制,用于记录自由基的纯旋转跃迁。记录的光谱没有来自闭壳物种的信号,允许在宽光谱窗口上相对快速地采集。测量了涉及旋转量子数N ” 和Ka ”值分别高达 41 和 18的跃迁,并与所有可用的高分辨率文献数据(纯旋转和来自旋转振动的基态组合差异)相结合,极大地改善了CH 2 CHO谱的建模。使用半刚性转子哈密顿量拟合组合的实验线列表,并将结果与量子化学计算进行比较。这项实验室研究提供了在各种星际环境中搜索 CH 2 CHO 所需的光谱信息,从寒冷(例如,对于稠密分子云,通常为 10 K)到温暖(例如,对于热科里诺斯,约 200 K)天体。
更新日期:2024-01-05
中文翻译:

亚毫米区域 CH2CHO 自由基的高分辨率光谱研究
在这项工作中,在毫米和亚毫米波长 (110–860 GHz) 下研究了乙烯氧基 (CH 2 CHO) 的纯旋转光谱。 CH 2 CHO 是通过在室温下在双程吸收池中使用原子氟从乙醛 (CH 3 CHO) 中提取 H 来产生的。塞曼调制光谱仪对吸收池内产生的外部磁场进行幅度调制,用于记录自由基的纯旋转跃迁。记录的光谱没有来自闭壳物种的信号,允许在宽光谱窗口上相对快速地采集。测量了涉及旋转量子数N ” 和Ka ”值分别高达 41 和 18的跃迁,并与所有可用的高分辨率文献数据(纯旋转和来自旋转振动的基态组合差异)相结合,极大地改善了CH 2 CHO谱的建模。使用半刚性转子哈密顿量拟合组合的实验线列表,并将结果与量子化学计算进行比较。这项实验室研究提供了在各种星际环境中搜索 CH 2 CHO 所需的光谱信息,从寒冷(例如,对于稠密分子云,通常为 10 K)到温暖(例如,对于热科里诺斯,约 200 K)天体。