Knowledge Bank

The techniques of electric resonance spectroscopy have been extended to the investigation of rotational transitions in the millimeter wavelength region. The experimental methods by which these observations are performed are described. Rotational transitions in hydrogen sulfide have been observed in an electric resonance apparatus. These are the first electric resonance experiments to be performed on an asymmetric rotor. The hyperfine structure of the $l-1\to l1$ transitions at 168.7 GHz are described. Stark measurements on hydrogen sulfide rotational transitions at have resulted in linewidths of 360 Hz at 216 GHz. The rotational transitions of $Li6F19$ have been studied at S9 GHz and 179 GHz in an electric resonance spectrometer. The details of this experiment and other possible investigations are given.