The source of radiations is a special type of electronic oscillator (called klystron). It produces monochromatic radiation of frequency corresponding to wave length range of 0.1 to a few hundred centimeters. The energies corresponding to these wavelengths are same as required for rotational transiting. The procedure consists in passing the monochromatic energy of the microwaves through the gaseous sample of the substance being studied and measuring the intensity of the transmitted radiation. By varying the frequency of the oscillator an observing the intensity of the transmitted beast he frequencies at which absorption takes place can be determined (from the poly of transmitted intensity verse frequency). From these data, the structural parameters like the moment of inertia, intern clear distance (bond lengths) etc. can be calculated.

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