Labels:fence | monitor | plant | road | sky | stairs | web site | window OCR: NCSA Mosaic Molecular Rotation File Edit Options Navigate Annotate Local Help System Remote Info Help URL http://chem. leeds ac uk. /tltp/rotation html Graphic of 2 rotating polyatomic molecule The size of the quantum associated with the rotational motion of molecules leads to emission and absorption of light in the microwave region of the electro-magnetic spectrum The condition for observing resonance 1t this region 15 that the molecule must possess permanent dip ole moment rotating dipole generates an electric field which can interact with the electric component of the ncrowave radiation. The easiest molecules to consider are diatomics but the ideas can easily be developed to deal with larger linear molecules and symmetric polyatomic molecules. Very complicated rotational spectra are see ...