Millimeterwave spectroscopy of stable molecules of astrophysical interest

We report the analysis of the laboratory spectra of some stable molecules of astrophysical interest in the millimeter wave range: deuterated isotopic species of methyl cyanide CH3CN ans methylacetylene CH3CCH which are abundant species in interstellar clouds and complex molecules like methylamine CH3NH2 and propene CH3CH=CH2. These two molecules present large amplitude motions and have complex spectra which necessitate specific treatment for their analysis.