Microwave Fourier-transform spectrometer for the entire K band for the investigation of rotational spectra of molecules in the gas phase

We present the experimental set up of a microwave Fourier-transform spectrometer for the entire K band from 18 to 26.4 GHz. It is hereby shown that this type of spectroscopy is achieved above 18 GHz. Advantages and disadvantages are discussed. The performance is illustrated by the recordings of rotational transitions of various molecules.