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Astronomical observations of (sub)millimeter wavelength pure rotationalemission lines of the second most abundant molecule in the Universe, CO, holdthe promise of probing regions of high temperature and density in the innermostparts of circumstellar envelopes. The rotational spectrum of vibrationallyexcited CO up to $\varv = 3$ has been measured in the laboratory between 220and 1940 GHz with relative accuracies up to $5.2 \times 10^{-9}$, correspondingto $\sim 5$ kHz near 1 THz. The rotational constant $B$ and the quarticdistortion parameter $D$ have been determined with high accuracy and even thesextic distortion term $H$ was determined quite well for $\varv = 1$ whilereasonable estimates of $H$ were obtained for $\varv = 2$ and 3. The presentdata set allows for the prediction of accurate rest frequencies ofvibrationally excited CO well beyond 2 THz.

Accurate laboratory rest frequencies of vibrationally excited CO up to $varv = 3$ and up to 2 THz