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Q band measurements is that electromagnets can reliably generate fields up to about 1 tesla. A collection of paramagnetic centers, such as free radicals, is exposed to microwaves at a fixed frequency. People exposed to radiation from the Chernobyl disaster have been examined by this method. EPR/ESR also has been used by archaeologists for the dating of teeth. Spin polarization is a third mechanism for interactions between an unpaired electron and a nuclear spin, being especially important for displaystyle pi -electron organic radicals, such as the benzene radical anion.
"Basics of Continuous Wave EPR". The magnetic field is homogeneous across the sample volume and has a high stability at static field. This reveals the decoherence, which is not refocused by the displaystyle pi pulse. Since different nuclei with unpaired electrons respond to different wavelengths, radio frequencies are required at times. Electron paramagnetic resonance ePR ) or electron spin resonance eSR ) spectroscopy is a method for studying materials with unpaired electrons.
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