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New Paradigm of Spin Exchange and its Manifestations in EPR Spectroscopy

机译：旋转交换的新范式及其在EPR光谱中的表现

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摘要

Theoretical results are presented, which have been confirmed experimentally and became basis for a new paradigm of spin exchange between paramagnetic particles in solutions and measurement of the spin exchange rate by EPR spectroscopy. Fundamental changes in the basics of spin exchange in solutions are associated with the transfer of coherence back from the interaction partner. It was shown that the transfer of spin coherence in random bimolecular collisions creates collective modes of evolution of quantum coherence of electron spins of paramagnetic particles. The EPR spectrum is the sum of the resonance lines. In the case of a slow spin coherence transfer, each spectral line has a mixed shape, it is the sum of the symmetric absorption line and the antisymmetric dispersion line. In the case of fast spin coherence transfer, only one collective mode is manifested in the EPR spectrum, the other modes are not manifested, since they are very weakly excited by the external microwave field, and they can be considered as forbidden lines in the spectrum or "dark" modes. The establishment of the mixed shape of the spectrum individual lines has fundamentally changed the protocol for finding the rate of bimolecular spin exchange caused by the exchange interaction. In the current existing paradigm, the contribution of the dipole-dipole interaction to the spin coherence transfer was mistakenly neglected.
机译：提出了理论结果，已经通过实验证实了，并成为了通过EPR光谱法测定了求解颗粒之间的旋转颗粒之间的旋转交换的新范式的基础。解决方案中的旋转交换基础知识的根本变化与互动伙伴的相干转移转移。结果表明，随机双分子碰撞中的旋转相干性的转移产生了能功颗粒的电子旋转量子的量子相干的演化的集体模式。 EPR光谱是谐振线的总和。在速旋转相干转移的情况下，每个光谱线具有混合形状，是对称吸收线和防反对二分散线的总和。在快速旋转相干转移的情况下，在EPR光谱中只表现出一个集体模式，其他模式不表现出来，因为它们是外部微波场非常弱激励，并且它们可以被认为是频谱中的禁区或“黑暗”模式。建立光谱各个线的混合形状从根本上改变了寻找由交换相互作用引起的双分子旋转交换速率的方案。在目前的现有范式中，逐下偶极偶极子相互作用对旋转相干转移的贡献被错误地忽略了忽略。

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