Triplet Paramagnetic Centers in Conducting Polymers – Study by ESR and SQUID
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Electron Spin Resonance
Electron spin resonance (ESR) is a spectroscopic technique that detects the transitions induced by electromagnetic radiation between the energy levels of electron spins in the presence of a static magnetic field. The method can be applied to the study of species containing one or more unpaired electron spins; examples include organic and inorganic radicals, triplet states, and complexes of para...
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The magnetisation and electron spin resonance (ESR) spectrum of two specimens of tetrahedral amorphous carbon (ta-C), deposited from a filtered cathodic arc, were measured over a wide temperature range. The magnetisation was found to consist of superparamagnetic, paramagnetic and diamagnetic contributions. The superparamagnetic contribution resembled that recently found in carbon prepared from ...
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Ab initio Hartree-Fock calculations have been performed on the electronic structure and spin properties of model clusters representing E’δ and triplet-state centers observed in amorphous SiO2 (a-SiO2). The calculated results strongly suggest that E’δ centers involve a trapped hole, shared between two Si atoms adjacent to a mono-oxygen vacancy in a silicon dioxide network. The calculated spin pr...
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تاریخ انتشار 2017