The carbon dioxide molecule

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Abstract
Accurate ground state rotational constants and reliable vibration-rotation interaction constants are available for CO2 and its isotopomers. Therefore CO2 has been used as a test case to study the various internuclear distances. We found that the r 0 distances appear, for a given carbon isotope, as a linear function of the inverse of the reduced mass. The r 3 distances obtained, even from purely ‘theoretical’ parameters, still show a small isotopic dependence. Finally Watson's method seems to yield, in the present case, r m distances differing from r e by only 5 × 10-5 Å.