Zero Time Resolution Nuclear Magnetic Resonance Transient in Solids
Zero Time Resolution Nuclear Magnetic Resonance Transient in Solids
复制标题
固体中的零时间分辨率核磁共振瞬态
DOI：
10.1088/0370-1328/82/1/303
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发表时间：
1963
影响因子：
5.7
通讯作者：
J. H. Strange
中科院分区：
文献类型：
--
作者：
J. Powles;J. H. Strange
描述了一种在固体中的宽线核磁共振脉冲后实验确定完整布洛赫衰变信号的方法。这种方法消除了构建非常困难的时间分辨率的瞬态设备的必要性。通过具有3微秒时间分辨率的装置，实际上已经实现了零时间分辨率。通过比较稳态吸收线的傅里叶变换与布洛赫衰减来测试该方法。对于谱线宽度高达 15 高斯的许多材料来说，达到 3% 的一致性。给出了支持实验结果的理论分析，并给出了“回波布洛赫衰减”的明确表达式，直至并包括时间的四次方项。给出了相同自旋的静态偶极相互作用的显式表达式。结果表明，吸收线的二阶矩和四阶矩可以从回波布洛赫衰减中获得，其精度与传统稳态方法相当，并且获得速度非常快且几乎不费力。
A method is described for the experimental determination of the complete Bloch decay signal after a pulse for broad line nuclear magnetic resonances, as in solids. This method removes the necessity for constructing transient equipment of very short time resolution which would be extremely difficult. By means of apparatus with a time resolution of 3 μsec effectively zero time resolution has been attained. The method is tested by comparing the Fourier transform of the steady state absorption line with the Bloch decay. Agreement to 3% is obtained for many materials having lines up to 15 gauss broad. A theoretical analysis is given which supports the experimental results and which gives an explicit expression for the `echo Bloch decay' up to and including terms of fourth power in the time. Explicit expressions are given for static dipolar interaction for identical spins. It is shown that the second and fourth moments of the absorption lines can be obtained from the echo Bloch decay with an accuracy comparable with that from conventional steady-state methods and these are obtained very rapidly and with little labour.