New Paradigm of Spin Exchange
The fundamental provisions of the NEW paradigm of spin exchangeand its manifestation in EPR spectroscopy
This website presents the key ideas of the new spin exchange paradigm, an approach designed to resolve the inconsistencies in the traditional theory in accordance with modern experimental data.
In contrast to the widely used paradigm, which considers only the equivalent exchange of spin states, the new paradigm includes a wider range of physical processes that affect the spin dynamics in dilute solutions.
We especially recommend that all researchers working in the field of spectroscopy pay attention: the conclusions and observations underlying this paradigm are likely to be significant for all types of spectroscopy – from EPR and NMR to other areas.
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With slow transfer of spin coherence, spin exchange and dipole-dipole interaction add up to broaden the EPR lines.
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The dipole-dipole interaction contributesto the rate of spin coherence transfer from the partner, which is subtracted from the spin exchange contribution. .
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With an increase in the spin exchange rate, the effect of exchange narrowing of the EPR spectrum does not necessarily occur.
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The transfer of spin coherence (the “recoil” effect) creates collective modes of motion of the spin magnetization.
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New interpretation of exchange narrowing of the EPR spectrum in the case of fast transfer of spin coherence.
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With slow transfer of spin coherence,each EPR resonance line has a mixed form: the sum of Lorentzian absorption and dispersion lines.
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In the presence of a microwave field, quasiparticles are formed, which can be called spin polaritons.
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A new kinetic equation is proposed for the motion of spin magnetization in dilute paramagnetstaking into account the transfer of spin coherence caused by spin exchange and dipole-dipole interaction of spins.