MARVEL analysis of high‐resolution rovibrational spectra of  13C 16O 2

Abstract

A set of empirical rovibrational energy levels, obtained through the MARVEL (measured active rotational‐vibrational energy levels) procedure, is presented for the CO isotopologue of carbon dioxide. This procedure begins with the collection and analysis of experimental rovibrational transitions from the literature, allowing for a comprehensive review of the literature on the high‐resolution spectroscopy of CO, which is also presented. A total of 60 sources out of more than 750 checked provided 14,101 uniquely measured and assigned rovibrational transitions in the wavenumber range of 579–13,735 cm. This is followed by a weighted least‐squares refinement yielding the energy levels of the states involved in the measured transitions. Altogether 6318 empirical rovibrational energies have been determined for CO. Finally, estimates have been given for the uncertainties of the empirical energies, based on the experimental uncertainties of the transitions. The detailed analysis of the lines and the spectroscopic network built from them, as well as the uncertainty estimates, all serve to pinpoint possible errors in the experimental data, such as typos, misassignment of quantum numbers, and misidentifications. Errors found in the literature data were corrected before including them in the final MARVEL dataset and analysis.

Rovibrational Energies of 13C16O2 Determined with Kilohertz Accuracy

“…Compared with line positions in different databases, HITRAN2020 derived from CDSD and AMES2021, the differences show strong J ″ dependence for the transitions in all three bands. Our accurate line positions could be used to increase the accuracy of other transition frequencies by applying the Ritz principle to refine the effective Hamiltonian model . The result can also help advance accurate remote sensing and isotope ratio determination.…”