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首页> 外文期刊>Applied Magnetic Resonance >Application of two-dimensional pulsed EPR nutation spectroscopy to a disordered system with large g-anisotropy
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Application of two-dimensional pulsed EPR nutation spectroscopy to a disordered system with large g-anisotropy

机译：二维脉冲EPR章动光谱在具有大g各向异性的无序系统中的应用

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Two-dimensional (2-D) pulsed electron paramagnetic resonance (EPR) nutation spectroscopy is applied to a disordered system with strongly anisotropic g-factors. The analysis and interpretation of a 2-D nutation spectrum is performed by theoretical calculations appropriate for ferric myoglobin cyanide in frozen solution. The observed and calculated 2-D spectra show broad signals which correspond to the principal g-values. The advantage of nutation spectroscopy is demonstrated by measuring the g(x) = 0.93 signal, which cannot be observed in a conventional field-swept spectrum due to large g strain broadening. It is shown that the 2-D nutation experiment can be considered as a sort of an angle-selected method but a nutation spectrum gives a powder pattern even for magnetic field settings at extreme field values of an EPR spectrum. This is in contrast to angle-selected electron nuclear double resonance, which gives a single-crystal type spectrum. The advantage of sine Fourier transform (FT) over complex FT is demonstrated for data processing in the nutation domain. Problems of experimental and data-processing procedures are also discussed. [References: 25]
机译：二维（2-D）脉冲电子顺磁共振（EPR）核磁共振光谱技术应用于具有强烈各向异性g因子的无序系统。通过适用于冷冻溶液中的氰化铁肌红蛋白的理论计算，可以对二维章动光谱进行分析和解释。观察到的和计算得到的二维光谱显示了与主要g值相对应的宽信号。通过测量g（x）= 0.93信号证明了章动光谱学的优势，由于大的g应变展宽，在常规的场扫描光谱中无法观察到该信号。结果表明，二维章动实验可以看作是一种角度选择方法，但是即使在EPR谱的极限场值下进行磁场设置，章动谱也能给出粉末图案。这与角度选择电子核双共振相反，后者给出了单晶类型的光谱。正弦傅立叶变换（FT）优于复杂FT的优势已在章动域中进行了数据处理。还讨论了实验和数据处理程序的问题。 [参考：25]

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