Spectroscopy and perturbation analysis of the CO A1-X1+ (2,0), (3,0) and (4,0) bands
Abstract
The (2,0) (3,0) and (4,0) bands of the A1-X1+ system of 12C16O have been re-investigated by high-resolution vacuum ultraviolet absorption spectroscopy. A VUV Fourier-transform spectrometer, illuminated by synchrotron radiation, was applied to record a jet-cooled spectrum, a room temperature static gas spectrum and a high temperature (900 K) quasi-static gas spectrum, resulting in absolute accuracies of 0.01-0.02 cm-1 for the rotational line frequencies. Precise laser-based data were included in the analysis allowing for a highly accurate determination of band origins. Rotational levels up to J=52 were observed. The data were used to perform an improved analysis of the perturbations in the A1, v=2, v=3, and v=4 levels by vibrational levels of the D1, I1-, e3-, d3, and a'3+ states.
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