A Stark-Effect Microwave Spectrograph of High Sensitivity

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Abstract
A microwave spectrograph is described in which the absorption of the gas being studied is modulated by the application of a periodic Stark-effect field so that the output of the crystal detector contains a radiofrequency component which can be amplified with a narrow-band amplifier. By using a very narrow band-width, achieved by employing phase-sensitive detection, high sensitivity is obtained. The klystron is swept mechanically over the frequency range. Details of the components are given.