Abstract
The sensitivity of a Stark-modulated waveguide microwave spectrometer can be significantly improved by using a travelling wave tube or solid state microwave amplifier prior to the crystal detection. In this paper the authors discuss the travelling wave tube. The increase in the sensitivity results from the improved noise figure of the travelling wave tube relative to crystal video type detectors. Wide bandwidth travelling wave tube or solid state amplifiers are available so full waveguide bandwidths may be utilised. Rotational transitions for J=1 from 0 lines of cyanogen bromide, BrCN, were measured with the travelling wave tube system and a standard video detector and the spectra are given here.
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