Abstract
Although the study of the rotational spectra of molecules considerably predates the discovery of interstellar molecules, the radioastronomical applications make three special demands. The first of these is that large radiotelescopes often have been designed for work at lower frequencies than the frequency ranges popularly studied by microwave spectroscopists. A second problem is that some potentially interesting interstellar species are short-lived and rapidly destroyed under normal laboratory conditions. A third problem is that other interesting substances especially those of biological importance are not volatile under normal laboratory conditions. Much of the activity of the Monash University Microwave Group has been directed towards tackling these problems. For the first problem a large L-band cell suitable for Stark modulation has been built. Its performance is illustrated by some recent results on a low frequency line of deuteromethanol.
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