The Sensitivity of Microwave Electron Spin Resonance Spectrometers for use with Aqueous Solutions†

Abstract

By the use of two alternative perturbation methods a theoretical study has been made of the dependence of detection sensitivity on sample size, type of cavity and microwave frequency. The results given by the two methods are in close agreement with each other and with experimentally determined sample dimensions. For aqueous samples there is little to choose between any frequency in the microwave band. The methods are perfectly general and may be readily extended to any solvent whose dielectric properties are known.