Measurement of spin-lattice relaxation times with longitudinal detection
Measurement of spin-lattice relaxation times with longitudinal detection
复制标题
DOI：
10.1007/bf03162315
复制
发表时间：
2001-01-01
影响因子：
1
通讯作者：
Schweiger, A
中科院分区：
文献类型：
--
作者：
Granwehr, J;Schweiger, A
本文介绍了在反转恢复和饱和恢复实验的基础上用纵向探测测量自旋-晶格弛豫时间T-1的新实验方案。利用这种方法，可以测量T-1值短至20 ns的顺磁物质。分析了减少无用信号和仪器伪影的可能性。还提出了一个实验，其中的信号是由随时间变化的M-2磁化直接感应。有机自由基和缺陷中心的实验结果，并与传统技术获得的数据进行比较，并在250 K的金属络合物进行了分析，它是非常困难的，因为快速自旋-自旋弛豫与已建立的方法得到有关弛豫时间的信息。
New experimental schemes to measure spin-lattice relaxation times T-1 on the basis of inversion-recovery and saturation-recovery experiments with longitudinal detection are introduced. With this approach, paramagnetic species with T-1 values as short as 20 ns can be measured. Possibilities to reduce unwanted signals and instrumental artifacts are analyzed. An experiment where the signal is induced directly by the time-dependent M-2 magnetization is also proposed. Experimental results for organic radicals and defect centers are presented and compared with data obtained with conventional techniques, and a metal complex at 250 K is analyzed where it is very difficult to get information about relaxation times with established methods because of fast spin-spin relaxation.