Solid-state NMR heteronuclear dipolar recoupling using off-resonance symmetry-based pulse sequences
Solid-state NMR heteronuclear dipolar recoupling using off-resonance symmetry-based pulse sequences
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DOI：
10.1016/s0009-2614(03)00103-9
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发表时间：
2003-03-14
影响因子：
2.8
通讯作者：
Nielsen, NC
中科院分区：
文献类型：
--
作者：
Bjerring, M;Nielsen, NC
介绍了一种将基于对称的伽马编码偶极再耦合与非共振射频辐射相结合的固体核磁共振异核偶极再耦合的新方法。用相同大小但符号相反的偏移量照射这两个自旋物种，可以在使用比开共振条件下更低的射频场强的情况下增加偶极标度因子。更大的比例使实验不太容易松弛，而释放的射频场要求促进了与快速魔角旋转的结合，同时保持了高效的H-1去耦合。此外，通过将非共振辐照调节到Lee-Goldburg条件，可以抑制同核偶极耦合。(C)2003 Elsevier Science B.V.保留所有权利。
A new approach to heteronuclear dipolar recoupling in solid-state NMR which combines symmetry-based, gamma-encoded dipolar recoupling with off-resonance rf irradiation is described. By irradiating the two spin species with offsets of equal magnitude but opposite sign, the dipolar scaling factor may be increased while using lower rf field strengths than under on-resonance conditions. Larger scaling makes the experiment less susceptible to relaxation, while released rf field requirements facilitate combination with fast magic-angle spinning while maintaining efficient H-1 decoupling. Furthermore, homonuclear dipolar couplings may be suppressed by adjusting the off-resonance irradiation to the Lee-Goldburg condition. (C) 2003 Elsevier Science B.V. All rights reserved.