Abstract
The paper describes the design, construction and performance of a continuous-wave spectrometer for use at temperatures between 77K and 80 degrees C. The limiting sensitivity for chlorine resonances with narrow lines is 1 mu mol and compounds of molar volume up to 104 cm3 can be studied. The corresponding figures for nitrogen resonances are 300 mu mol and 103 cm3. The continuous tuning range with a single coil is 2.5:1 and the resolution is a few PPM. It uses bisymmetric Zeeman modulation, there are no critical adjustments and no elaborate extra equipment is required.