具有轴对称电场梯度张量的氮 - 14四极自旋系统中的自旋回波。
Spin-echoes in nitrogen-14 quadrupolar spin-system with axially symmetric electric field gradient tensor.
作者信息
Rudakov T N, Mikhaltsevitch V T, Flexman J H
机构信息
QR Sciences Ltd, Research Division, Cannington WA 6107, Australia.
出版信息
Solid State Nucl Magn Reson. 2004 Jan;25(1-3):112-8. doi: 10.1016/j.ssnmr.2003.03.004.
The behaviour of the magnetisation in the spin-1 system with the axial symmetry of the electric field gradient (EFG) tensor was analysed theoretically. The behaviour of the NQR signals in hexamethylenetetramine (C6H12N4) was also studied experimentally using the pulse NQR technique and sensitive equipment. It was shown that the axial symmetry of the EFG in a sample could not be the reason why spin-echo signals were not observed in conventional pulse experiments for the same type of sample. A very short spin-spin relaxation time T2 seems to be the reason of that. The signal-to-noise ratio was sufficient for measuring T2 in C6H12N4, which had not been reported earlier. Experimental results of applying certain pulse sequences to the 14N NQR in a sample are also presented.
从理论上分析了具有电场梯度（EFG）张量轴对称性的自旋-1系统中磁化强度的行为。还使用脉冲NQR技术和灵敏设备对六亚甲基四胺（C6H12N4）中的NQR信号行为进行了实验研究。结果表明，样品中EFG的轴对称性并非在同一类型样品的传统脉冲实验中未观察到自旋回波信号的原因。极短的自旋-自旋弛豫时间T2似乎是其原因。信噪比足以测量C6H12N4中的T2，这在之前未曾报道过。文中还给出了对样品中14N NQR应用某些脉冲序列的实验结果。
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