High-Resolution Study of ¹³C¹⁶O A–X(v′ = 0–9) Bands Using the VUV-FTS at SOLEIL: Revised Term Values

We present high-resolution absorption spectral measurements of the A¹Π–X¹Σ⁺ band system of ¹³C¹⁶O. These were recorded with the VUV Fourier transform spectrometer (VUV-FTS) installed on the DESIRS beamline at the SOLEIL synchrotron. This work includes revised term values that extend to higher J′ values than previous measurements for most v′ levels and lower J′ values for v′ = 0. We confirm previously observed perturbations of the rotational levels in greater detail and present evidence for new perturbations. The accuracy in the wavelength determination and term values is on average within 0.01 cm^–1, improving upon previous measurements.