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New Paradigm of Spin Exchange and its Manifestations in EPR Spectroscopy
Applied Magnetic Resonance ( IF 1 ) Pub Date : 2020-01-06 , DOI: 10.1007/s00723-019-01184-y
K. M. Salikhov

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.

中文翻译:

自旋交换的新范式及其在 EPR 光谱学中的表现

提出了理论结果,这些结果已通过实验得到证实,并成为溶液中顺磁性粒子之间自旋交换的新范式和 EPR 光谱测量自旋交换率的基础。解决方案中自旋交换基础的根本变化与从交互伙伴传回连贯性有关。结果表明,随机双分子碰撞中自旋相干性的转移产生了顺磁性粒子电子自旋量子相干性的集体演化模式。EPR 谱是共振线的总和。在慢自旋相干转移的情况下,每条谱线具有混合形状,它是对称吸收线和反对称色散线的总和。在快速自旋相干转移的情况下,EPR谱中只出现一种集体模式,其他模式没有出现,因为它们受到外部微波场的激发非常微弱,可以认为是频谱中的禁线或“暗”模式。光谱单线混合形状的建立从根本上改变了寻找由交换相互作用引起的双分子自旋交换速率的协议。在当前现有的范式中,偶极-偶极相互作用对自旋相干转移的贡献被错误地忽略了。光谱单线混合形状的建立从根本上改变了寻找由交换相互作用引起的双分子自旋交换速率的协议。在当前现有的范式中,偶极-偶极相互作用对自旋相干转移的贡献被错误地忽略了。光谱单线混合形状的建立从根本上改变了寻找由交换相互作用引起的双分子自旋交换速率的协议。在当前现有的范式中,偶极-偶极相互作用对自旋相干转移的贡献被错误地忽略了。
更新日期:2020-01-06
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