A high sensitivity toroid detector for 17O NMR
A high sensitivity toroid detector for 17O NMR
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用于 17O NMR 的高灵敏度环形检测器
DOI：
10.1016/0022-2364(83)90180-4
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发表时间：
1983
影响因子：
2.2
通讯作者：
H. Dorn
中科院分区：
文献类型：
--
作者：
T. Glass;H. Dorn
灵敏度仍然是/sup 17/O NMR的限制因素，这在许多情况下意味着使用同位素富集的氧-17样品。以前报道的数据表明，与传统的亥姆霍兹线圈检测器相比，环形单元和线圈检测器具有潜在的信噪比优势。在该研究中，考虑了小样本量的窄线核素（即/sup 1/H）。环形设计还可以为大样品体积提供灵敏度优势。四个不同的环形派热克斯细胞和线圈的窄口径光谱仪，以测试设计的17/O NMR，主要考虑的是B/sub 1/均匀性。证实了信噪比的优势。对于窄孔磁体（差的B/sub 1/均匀性），相对于亥姆霍兹线圈设计的优势是3.2 - 4.1，对于宽孔磁体，对于相对大的样品体积（10 - 20 m1），优势可以是4 - 5。
Sensitivity remains the limiting factor in /sup 17/O NMR which in many cases means the use of isotopically enriched oxygen-17 samples. Previously reported data suggest a potential signal-to-noise advantage for a toroid shaped cell and coil detector compared with a conventional Helmholtz coil detector. In that study narrow-line nuclides (ie /sup 1/H) with small sample volumes were considered. The toroid design can also provide a sensitivity advantage for large sample volumes. Four different toroid Pyrex cells and coils were constructed for a narrow bore spectrometer to test the design for /sup 17/O NMR; the main consideration being B/sub 1/ homogeneity. The signal-to-noise advantage is confirmed. For narrow bore magnets (poor B/sub 1/ homogeneity) the advantage over the Helmholtz coil design is 3.2 - 4.1, for wide bore magnets the advantage can be 4 - 5 for relatively large sample volumes (10 - 20 m1).