MEASUREMENT OF ELECTRON SPIN RESONANCE DIFFERENCE SPECTRA AT 77 °K: APPLICATIONS OF THE METHOD IN LOW-TEMPERATURE RADIATION CHEMISTRY

Publisher Website
Google Scholar
Abstract
The technique of measuring e.s.r. difference spectra has been extended to 77 °K. This enables elimination of the main signal due to irradiated silica sample tubes and of about 90% of the hydrogen atom signal from the same source. Under certain conditions, e.g. when the e.s.r. spectrum due to one species can be photochemically bleached, the method permits resolution of two superimposed spectra. This has been demonstrated by measurements which resolve the e.s.r. singlet due to trapped electrons in irradiated tetrahydro-2-methylfuran from the underlying septet. These developments have rendered the e.s.r. difference method very useful for the study of paramagnetic species formed in systems which have been γ-irradiated at 77 °K.