Carbon monoxide is thought to be the second most abundant molecule in the Universe. This makes observation of both its parent isotopologue ($^{ 12}$C$^{ 16}$O) and its stable isotopologues, $^{ 13}$C$^{ 16}$O, $^{ 12}$C$^{ 18}$O, $^{ 12}$C$^{ 17}$O, $^{ 13}$C$^{ 18}$O and $^{ 13}$C$^{ 17}$O, 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 $^{ 13}$C$^{ 16}$O, $^{ 12}$C$^{ 18}$O, $^{ 12}$C$^{ 17}$O, $^{ 13}$C$^{ 18}$O and $^{ 13}$C$^{ 17}$O, respectively, giving 863, 499, 33, 345 and 45 empirically determined, rotation vibration energy levels, respectively.
Categories: astro-ph.GA