Rotational far infrared spectrum of 13CO

Abstract The pure rotational spectrum of 13 CO between 0.66 and 3.3 THz has been measured with a tunable far infrared spectrometer. Revised values for B 0 , D 0 , and H 0 have been obtained with a 1σ standard deviation of 50 kHz. Additional measurements were performed with a Fourier transform spectrometer, and a 1 MHz (3.3 × 10 −5 cm −1 ) measurement accuracy is demonstrated with this device. The rotational spectrum from J ″ = 0 to J ″ = 30 is calculated and gives the frequencies with a 1 σ uncertainty of less than 120 kHz.

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