MOLECULAR-BEAM MILLIMETER SIDE-BAND FOURIER-TRANSFORM SPECTROMETER (MB-MMSBFT)

The high resolution Fourier transform technique has been extensively a pplied in the centimeter range. In the past few years great progress h ave been made in observing molecular complexes. Most instruments opera te between 2 and 26 GHz. So, very light interesting molecular species cannot be observed. The extension of the method towards the millimeter range suffers important technological shortcomings. A sidebands gener ation technic allowing the generation of very short pulses, all over t he millimeter wave range, is described. For the first time, the experi ment is performed in a resonant cavity and on a supersonic nozzle beam .