Frequency measurement of pure rotational transitions of OH

Abstract Frequencies of pure rotational transitions of OD − have been measured in the 1–5 THz region using a high-precision tunable far-infrared spectrometer based on difference frequency of two CO 2 lasers. The measured frequencies were analyzed together with the data in the infrared and the sub-millimeter region to refine the rotational parameters. Isotopically invariant Dunham parameters were also obtained.

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