High-resolution study of 13C16O A-X(v' = 0-9) bands using the VUV-FTS at SOLEIL: revised term values

Area of Science:

• Molecular Spectroscopy
• Quantum Chemistry
• Astrophysics

Background:

• The electronic structure of carbon monoxide (CO) is crucial for understanding chemical processes in various environments.
• Previous spectroscopic studies have provided valuable data, but gaps remain in understanding rotational level perturbations and term values.

Purpose of the Study:

• To conduct high-resolution absorption spectral measurements of the A(1)Π-X(1)Σ(+) band system of isotopically substituted carbon monoxide ((13)C(16)O).
• To refine term values and investigate rotational level perturbations with enhanced accuracy and precision.

Main Methods:

• Utilizing a VUV Fourier transform spectrometer (VUV-FTS) on the DESIRS beamline at the SOLEIL synchrotron.
• Recording high-resolution absorption spectra to analyze the A(1)Π-X(1)Σ(+) band system.

Main Results:

• Revised term values were determined, extending to higher J' values for most v' levels and lower J' values for v' = 0.
• Previously observed perturbations were confirmed in greater detail, and evidence for new perturbations was presented.
• Wavelength determination and term values achieved an average accuracy of 0.01 cm(-1), surpassing previous measurements.

Conclusions:

• The study provides a more comprehensive and accurate spectroscopic dataset for (13)C(16)O.
• The refined data and identification of new perturbations enhance our understanding of molecular interactions and energy levels in CO.
• This improved spectroscopic information is valuable for astrophysical and chemical modeling.