RT info:eu-repo/semantics/article
T1 Internal rotation analysis of the microwave and millimeter wave spectra of fluoral (CF3CHO)
A1 Bermúdez Arias, María Celina
A1 Motiyenko, Roman
A1 Cabezas, Carlos
A1 Ilyushin, Vadim V.
A1 Margulès, Laurent D.
A1 Endo, Yasuki
A1 Guillemin, Jean-Claude
K1 Molecular spectroscopy
K1 Espectroscopía molecular
K1 Rotational spectroscopy
K1 Espectroscopía rotacional
K1 Fluorinated aldehydes
K1 Aldehídos fluorados
AB The rotational spectrum (4–40 GHz and 50–330 GHz) has been measured and analyzed for trifluoroacetaldehyde, also known as fluoral (CF3CHO), which is one of the degradation products of the fluorinated contaminants emitted into the atmosphere. The complexity of the spectroscopic analysis of this molecule arises from the strong coupling between the internal rotation motion of CF3 group and the overall rotation of the molecule. The value obtained for its coupling constant (ρ = 0.91723481(49)) is comparable to the corresponding value of methanol (CH3OH, ρ = 0.81), which is known for its complex spectrum. A total of 12,322 transitions of the ground, the first and second excited torsional states (ΔE1υt = 62.0183(13)cm−1; ΔE2υt = 120.3315(13)cm−1) with J ≤ 50 were included in the analysis that was performed employing the rho-axis-method (RAM), and the RAM36 code. A fit within experimental error (root mean square deviation equals to 35 kHz) has been achieved for this dataset using 47 parameters of the RAM torsion-rotation Hamiltonian. In the course of the analysis, it became evident that for such high ρ value, as it is determined for fluoral, a larger than usual torsional basis set at the first diagonalization step of the two-step diagonalization procedure is required for achieving a fit within experimental error.
PB Elsevier
SN 1386-1425
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/55698
UL https://uvadoc.uva.es/handle/10324/55698
LA eng
NO Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2022, vol. 274, 121071
NO Producción Científica
DS UVaDOC
RD 22-dic-2024