Rapid-scan EPR with triangular scans and fourier deconvolution to recover the slow-scan spectrum
Rapid-scan EPR with triangular scans and fourier deconvolution to recover the slow-scan spectrum
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DOI：
10.1016/j.jmr.2005.03.013
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发表时间：
2005-07-01
影响因子：
2.2
通讯作者：
Eaton, GR
中科院分区：
文献类型：
--
作者：
Joshi, JP;Ballard, JR;Eaton, GR
直接检测的快速扫描EPR信号记录使用三角形场扫描速率在1.7和150 kG/s之间的脱氧样品的酞菁锂（LiPc）和Nyonytrityl-CD 3。这些扫描速率相对于电子自旋弛豫时间的倒数是快速的，并且引起信号中的特征振荡。傅立叶反卷积与分析功能允许恢复的线型与实验慢扫描光谱符合得很好。与慢扫描EPR不同，直接检测快速扫描EPR不使用相敏检测，而是直接记录吸收信号而不是吸收信号的一阶导数。信号的幅度随着施加的磁场梯度近似线性地减小。通过从具有缺失角度的数据集的滤波反投影重建LiPc和三苯甲基-CD 3的体模构建的前样本的图像。来自图像的光谱切片中的线形与慢扫描光谱很好地一致，并且样品管之间的间距与已知的样品几何形状很好地匹配。(c)2005年爱思唯尔公司All rights reserved.
Direct-detected rapid-scan EPR signals were recorded using triangular field scan rates between 1.7 and 150 kG/s for deoxygenated samples of lithium phthalocyanine (LiPc) and Nycomed trityl-CD3. These scan rates are rapid relative to the reciprocals of the electron spin relaxation times and cause characteristic oscillations in the signals. Fourier deconvolution with an analytical function permitted recovery of lineshapes that are in good agreement with experimental slow-scan spectra. Unlike slow-scan EPR, direct detection rapid-scan EPR does not use phase sensitive detection and records the absorption signal directly instead of the first derivative of the absorption signal. The amplitude of the signal decreases approximately linearly with applied magnetic field gradient. Images of phantoms constructed front samples of LiPc and trityl-CD3 were reconstructed by filtered back-projection from data sets with a missing angle. The lineshapes in spectral slices from the image are in good agreement with slow-scan spectra and the spacing between sample tubes matches well with the known sample geometry. (c) 2005 Elsevier Inc. All rights reserved.