MARVEL Analysis of the Measured High-resolution Spectra of CO Isotopologues
Abstract
Carbon monoxide is thought to be the second most abundant molecule in the Universe. This makes observation of both its parent isotopologue (12C16O) and its stable isotopologues, 13C16O, 12C18O, 12C17O, 13C18O and 13C17O, important in variety of objects. Here the MARVEL (Measured Active Rotational-Vibrational Energy Levels) algorithm is used to determine precise rotational vibrational energy levels for the five minor isotopologues of carbon monoxide in their electronic ground state. A review of 27 literature sources yields 3716, 1454, 89, 728 and 57 validated transitions for 13C16O, 12C18O, 12C17O, 13C18O and 13C17O, respectively, giving 863, 499, 33, 345 and 45 empirically determined, rotation vibration energy levels, respectively.
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