THz spectrum of monodeuterated methane

We report new measurements of the rotational spectrum of monodeuterated methane (CH3D) in the range of 690-1200 GHz which allow for an accurate prediction of all lines in the range of the high-resolution spectrometer of the Herschel Space Observatory. Comparison is also made with the previous analysis based on infrared combination differences. Three lines of 13CH3D were measured in natural abundance.