High resolution spectroscopic investigation of the CH 2 CHO radical in the sub-millimeter region - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry A Year : 2024

High resolution spectroscopic investigation of the CH 2 CHO radical in the sub-millimeter region

Abstract

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 K$_a$″ 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.
Embargoed file
Embargoed file
0 1 9
Year Month Jours
Avant la publication
Friday, July 5, 2024
Embargoed file
Friday, July 5, 2024
Please log in to request access to the document

Dates and versions

hal-04560253 , version 1 (26-04-2024)

Identifiers

Cite

Rosemonde Chahbazian, Marie-Aline Martin-Drumel, Olivier Pirali. High resolution spectroscopic investigation of the CH 2 CHO radical in the sub-millimeter region. Journal of Physical Chemistry A, 2024, 128 (2), pp.370-377. ⟨10.1021/acs.jpca.3c06326⟩. ⟨hal-04560253⟩
0 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More