| Résumé | The infrared spectrum of (12C18O)2 has been studied for the first time using a tunable diode laser spectrometer in the 2095 cm−¹ region to probe a pulsed supersonic jet expansion. Very dilute gas mixtures of CO in He were used, resulting in small consumption of 12C18O sample gas, as well as cold and simple spectra. The results were analyzed using a term value scheme to obtain model-independent energies for 7 rotational levels belonging to 2 stacks in the lower state, vCO=0, and 22 levels belonging to 7 stacks in the upper state, vCO=1. The two ground state isomers of the CO dimer were found to be separated by only 0.639 cm−¹ for (12C18O)2. These results provide a foundation for future studies of the millimeter wave spectrum. |
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