Spectroscopy and perturbation analysis of the A1(v=0) state of 13C16O
Abstract
The lowest v=0 level of the A1, state of the 13C16O isotopologue of carbon monoxide has been reinvestigated with a variety of high resolution spectroscopic techniques. The A1-X1+(0,0) band has been studied by vacuum-ultraviolet Fourier-transform absorption spectroscopy, using the SOLEIL synchrotron as a radiation source. Spectra were obtained under quasi-static gas conditions at liquid-nitrogen temperature, room temperature and at an elevated temperature of 900 K, with absolute accuracies of 0.01-0.03 cm-1. Two-photon Doppler-free laser spectroscopy has been applied to a limited number of transitions in the A1-X1+(0,0) band, under collision-free circumstances of a molecular beam, yielding an absolute accuracy of 0.002 cm-1. The third technique is high-resolution Fourier-transform emission spectroscopy in the visible region applied to the B1+-A1(0,0) band in a gas discharge, at an absolute accuracy of up to 0.003 cm-1. With these methods rotational levels of A1(0) could be studied in both parity components up to a rotational quantum number of J=46. The frequencies of 397 transitions were used to analyse the perturbations between the A1(0) level by vibrational levels of the D1\!, e3-, d3\!, and a'3+ states.
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