The microwave spectrum of isotopically substituted CO+ ion

Abstract
The frequencies of the N = 0–1 transitions of C18O+ and 13CO+ have been measured, and those of the main isotopic form have been remeasured. The hyperfine parameters of 13CO+ have been obtained and compared to those previously determined in the laser‐ion beam experiments of Carrington et al. The isotopic variations of the spin‐rotation parameter γ have been studied, and evidence for breakdown of the Born–Oppenheimer approximation has been observed in the isotopic dependence of the rotational constant B0.

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