Multifrequency electron spin echo envelope modulation in S=1/2, I=1/2 systems: Analysis of the spectral amplitudes, line shapes, and linewidths
Multifrequency electron spin echo envelope modulation in S=1/2, I=1/2 systems: Analysis of the spectral amplitudes, line shapes, and linewidths
复制标题
S=1/2、I=1/2 系统中的多频电子自旋回波包络调制：频谱幅度、线形和线宽分析
DOI：
10.1063/1.455293
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发表时间：
1988
影响因子：
4.4
通讯作者：
D. Singel
中科院分区：
文献类型：
--
作者：
A. Lai;H. L. Flanagan;D. Singel
本文分析了S=1/2，I=1/2系统的核调制效应，特别强调了外场强度变化的影响。我们表明，调制深度参数k达到其最大可能值时，塞曼和超精细相互作用的大小相等，或“匹配”，这种匹配起着主导作用，在确定的ESEEM（电子自旋回波包络调制）线的形状，独特的ESEEM光谱特征很容易理解在此基础上。通过多频ESEEM，可以解释这些特征并利用它们来测量超精细相互作用。我们讨论了几个实验策略，涉及ESEEM振幅，线的形状和线宽的字段依赖性，用于确定超精细耦合常数。
The nuclear modulation effect in S=1/2, I=1/2 systems is analyzed with particular emphasis on the impact of variation of the external field strength. We show that the modulation depth parameter k reaches its maximum possible value when the Zeeman and hyperfine interactions are made equal in magnitude, or ‘‘matched,’’ and that this matching plays the dominant role in determining the ESEEM (electron spin echo envelope modulation) line shapes; the distinctive ESEEM spectral features are readily understood on this basis. Through multifrequency ESEEM, it is possible to interpret the features and to utilize them to measure hyperfine interactions. We discuss several experimental strategies, involving the field dependences of ESEEM amplitudes, line shapes, and linewidths, for determining hyperfine coupling constants.