Dipolar spectroscopy and spin alignment in electron paramagnetic resonance
Dipolar spectroscopy and spin alignment in electron paramagnetic resonance
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DOI：
10.1016/s0009-2614(00)01171-4
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发表时间：
2000-12-01
影响因子：
2.8
通讯作者：
Spiess, HW
中科院分区：
文献类型：
--
作者：
Jeschke, G;Pannier, M;Spiess, HW
介绍了两种用于电子自旋之间重新聚焦(筛选)偶极耦合的单频技术。这些实验是基于固体回声序列和Jeener-Broekkart序列，这两个序列在固体的偶极核磁共振谱中得到了很好的建立，并开辟了对光谱仪只有中等要求的高分辨率二维EPR谱的新途径。对于大于3纳米的顺磁中心之间的距离，SIFTER提供了比双电子-电子共振(DER)更好的分辨率。对于形状持久的双自由基，筛子测量和力场计算的距离之间有很好的一致性，距离高达5.1 nm，对应于390 kHz的偶极频率。(C)2000 Elsevier Science B.V.保留所有权利。
Two single-frequency techniques for refocusing (SIFTER) dipolar couplings between electron spins are introduced. The experiments are based on the solid-echo and Jeener-Broekaert sequences, well established in dipolar NMR spectroscopy of solids, and open up new routes to high-resolution two-dimensional EPR spectroscopy with only moderate requirements on the spectrometer. For distances between paramagnetic centres larger than 3 nm, SIFTER provides better resolution than double electron-electron resonance (DEER). Good agreement between distances from SIFTER measurements and force-field computations is found for shape-persistent biradicals with distances up to 5.1 nm corresponding to a dipolar frequency of 390 kHz. (C) 2000 Elsevier Science B.V. All rights reserved.