Abstract
A heterodyne beat method of determination of unstable free radicals has been investigated. A change in the magnetic susceptibility of a liquid placed inside the coil of an oscillating circuit causes a change of frequency which is measured by beating against a quartz crystal oscillator. The apparatus has been tested by determinations of paramagnetic salts and diamagnetic liquids. It is shown that the ultimate limitation on increasing the sensitivity is the temperature control of the free running oscillator. The modification of the apparatus for the detection of free radicals of half-life times down to 0.05 s is discussed.
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