DOUBLE NUCLEAR MAGNETIC RESONANCE AND THE DIPOLE INTERACTION IN SOLIDS
DOUBLE NUCLEAR MAGNETIC RESONANCE AND THE DIPOLE INTERACTION IN SOLIDS
复制标题
双核磁共振与固体中的偶极子相互作用
DOI：
10.1103/physrev.111.853
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发表时间：
1958
期刊：
影响因子：
--
通讯作者：
R. M. Cotts
中科院分区：
文献类型：
--
作者：
L. Sarles;R. M. Cotts
用扩展的磁共振技术研究了氟化钠多晶样品中的核磁偶极子相互作用。用变频谱仪观察了Na/SUP23/在固定外加磁场中的共振吸收，并计算了线形的均方宽度。这个宽度有两个主要来源：(A)Na/sup 23/核通过磁矩的偶极场与其他Na/sup 23/核的相互作用，以及(B)Na/sup 23/核与邻近的F/sup 19/核通过相同的机制相互作用。在相同的外场中施加一个满足F/sup 19/核共振条件的强射频场，引起了氟的塞曼能级之间的快速跃迁，从而改变了由氟的核磁矩在钠核位置产生的平均场。通过改变这个射频场的强度，也通过改变F/SUP19/自旋的精确共振的偏差，人们可以选择性地改变这个谱线加宽源的贡献。可用的射频场强度不足以完全消除源(B)引起的铜化。然而，More的详细行为？这种对宽度的贡献作为共振偏差的函数，与Bloch的理论非常一致，在与所涉及的线宽相比，射频场较强的情况下。(Auth)(更少)
The nuclear magnetic dipole interactions in a polycrystalline sample of sodium fluoride were investigated using an extension of the magnetic resonance technique. The resonance absorption of Na/sup 23/ was observed with a variable- frequency spectrometer in a fixed external magnetic field, and the mean square width of the line shape computed. This width has two main sources: (a) the interaction of Na/sup 23/ nuclei with other Na/sup 23/ nuclei through the dipole fields of the magnetic moments, and (b) the interaction of Na/sup 23/ nuclei with neighbcring F/sup 19/ nuclei by the same mechanism. The application of a strong rf field satisfying the resonance condition for F/sup 19/ nuclei in the same external field caused rapid transitions between the fluorine Zeeman energy levels, and thus altered the average field produced at the position of sodium nuclei by the nuclear magnetic moments of fluorine. By varying the strength of this rf field and also by varying the deviation from precise resonance of the F/ sup 19/ spins, one could selectively alter the contributions of this source of line broadening. The available rf field was not sufficiently intense to eliminnte entirely the brondening caused by source (b). However, the detailed behavior ofmore » this contribution to the width as a function of the deviation from resonance agrees well with a theory of Bloch for the case of the rf field strong compared to the line widths involved. (auth)« less