Hyperfine Spectroscopy - ENDOR
Hyperfine Spectroscopy - ENDOR
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DOI：
10.1002/9780470034590.emrstm1515
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发表时间：
2016-01-01
期刊：
影响因子：
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通讯作者：
Harmer, Jeffrey R.
中科院分区：
文献类型：
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作者：
Harmer, Jeffrey R.
电子-核双共振（ENDOR）是一种广泛使用的技术，用于测量溶液、单晶和无序系统（如粉末和冷冻溶液）中顺磁中心的核频率。本文首先从理论上概述了在强耦合和弱耦合区域中低自旋和高自旋系统的能级和相应的ENDOR谱。高场ENDOR的优点被认为是。然后解释CW ENDOR和三重CW ENDOR的基础。脉冲ENDOR技术背后的重要概念，然后介绍，从一维戴维斯和一维米姆斯ENDOR，三重，其次是二维技术，旨在增加从数据中提取的信息内容。确定超精细耦合的符号的方法进行了描述，以及随机RF激励，非线性采集方案，回波链检测序列，旨在增加实验的稳定性和灵敏度的优点。
Electron-nuclear double resonance (ENDOR) is a widely used technique to measure the nuclear frequencies of paramagnetic centers in solution, single crystals, and disordered systems such as powders and frozen solutions. This article starts with a theoretical overview of the energy levels and corresponding ENDOR spectra of low-and high-spin systems in the strong and weak coupling regimes. Advantages of high-field ENDOR are considered. The basis of CW ENDOR and triple CW ENDOR is then explained. The important concepts behind pulse ENDOR techniques are then introduced, starting with 1D Davies and 1D Mims ENDOR, triple, and followed by two-dimensional techniques that aim to increase the information content extractable from the data. Methods to determine the sign of the hyperfine coupling are described, as well as the advantages of stochastic RF excitation, nonlinear acquisition schemes, and echo train detection sequences that are designed to increase experiment stability and sensitivity.