Suppr超能文献

自旋 I=1 双量子滤波 NMR 光谱学中仪器伪影的模拟研究。

Simulation studies of instrumental artifacts on spin I=1 double quantum filtered NMR spectroscopy.

机构信息

Brooklyn College, Department of Physics, 2900 Bedford Avenue, Brooklyn, NY 11210, United States.

出版信息

J Magn Reson. 2010 Jul;205(1):102-8. doi: 10.1016/j.jmr.2010.04.008. Epub 2010 Apr 24.

Abstract

We report on the results of a simulation based study of the effect of various experimental artifacts for spin I=1 double quantum filtered NMR. The simulation captures the effects of static field inhomogeneity, finite pulse widths, phase errors, transients and radio frequency field inhomogeneity. We simulated the spectral distortions introduced under these errors for four, eight and sixteen step phase cycles that are well known in the NMR community. The dominating pulse errors are radio frequency field inhomogeneity and antisymmetric pulse transients. These errors result in the reduction of signal intensity as well as an introduction of distortions in the detected double quantum filtered spectrum. Using the simulation tool we studied the improvement one obtains when implementing a sixteen step phase cycle over a four step phase cycle. The results indicate that implementing a sixteen step phase cycle over an eight or four step phase cycle does not result in a significant reduction in the DQF intensity loss, or reduction in spectral distortions for antisymmetric transients.

摘要

我们报告了基于模拟的自旋 I=1 双量子滤波 NMR 实验伪影影响的研究结果。该模拟捕获了静态磁场不均匀性、有限脉冲宽度、相位误差、瞬变和射频场不均匀性的影响。我们模拟了在这些误差下,对于在 NMR 领域广为人知的四个、八个和十六个相循环步骤引入的光谱失真。主要的脉冲误差是射频场不均匀性和非对称脉冲瞬变。这些误差会导致信号强度降低,以及检测到的双量子滤波光谱出现失真。我们使用仿真工具研究了当在四步相循环中实现十六步相循环时可以获得的改善。结果表明,在八步或四步相循环中实现十六步相循环不会导致 DQF 强度损失显著降低,或者非对称瞬变引起的光谱失真减少。

相似文献

1
Simulation studies of instrumental artifacts on spin I=1 double quantum filtered NMR spectroscopy.
J Magn Reson. 2010 Jul;205(1):102-8. doi: 10.1016/j.jmr.2010.04.008. Epub 2010 Apr 24.
2
Effects of instrumental artifacts on triple quantum filtered NMR spectra for spin I=3/2.
J Magn Reson. 2016 Jul;268:10-17. doi: 10.1016/j.jmr.2016.04.013. Epub 2016 Apr 26.
3
Investigation of the effect of a variety of pulse errors on spin I=1 quadrupolar alignment echo spectroscopy.
J Magn Reson. 2011 Aug;211(2):134-42. doi: 10.1016/j.jmr.2011.05.003. Epub 2011 May 18.
4
Use of composite refocusing pulses to form spin echoes.
J Magn Reson. 2012 Jan;214(1):68-75. doi: 10.1016/j.jmr.2011.10.006. Epub 2011 Oct 19.
5
Reduction of spin diffusion artifacts from 2D zfr-INADEQUATE MAS NMR spectra.
J Magn Reson. 2011 Jan;208(1):70-5. doi: 10.1016/j.jmr.2010.10.006. Epub 2010 Oct 29.
6
Supercycled symmetry-based double-quantum dipolar recoupling of quadrupolar spins in MAS NMR: I. Theory.
J Magn Reson. 2009 Oct;200(2):267-79. doi: 10.1016/j.jmr.2009.07.007. Epub 2009 Jul 12.
8
Improved pulse schemes for separated local field spectroscopy for static and spinning samples.
Solid State Nucl Magn Reson. 2008 Mar;33(3):57-63. doi: 10.1016/j.ssnmr.2008.03.001. Epub 2008 Mar 4.
9
Application of shaped adiabatic pulses to MQMAS NMR spectroscopy of spin 3/2 nuclei.
J Magn Reson. 2009 Feb;196(2):191-9. doi: 10.1016/j.jmr.2008.11.005. Epub 2008 Nov 18.
10
Two-dimensional MAS NMR correlation protocols involving double-quantum filtering of quadrupolar spin-pairs.
J Magn Reson. 2010 May;204(1):99-110. doi: 10.1016/j.jmr.2010.02.007. Epub 2010 Feb 12.

引用本文的文献

1
Theoretical calculation of a composite pulse for H broadband excitation by average Hamiltonian theory.
Bo Pu Xue Za Zhi. 2015 Jun 5;32(2):373-381. doi: 10.11938/cjmr20150219.
2
Investigation of the effect of a variety of pulse errors on spin I=1 quadrupolar alignment echo spectroscopy.
J Magn Reson. 2011 Aug;211(2):134-42. doi: 10.1016/j.jmr.2011.05.003. Epub 2011 May 18.

本文引用的文献

1
Selection of coherence-transfer pathways in NMR pulse experiments. 1984.
J Magn Reson. 2011 Dec;213(2):276-94. doi: 10.1016/j.jmr.2011.08.033.
2
Reduction of B(0) inhomogeneity effects in triple-quantum-filtered sodium imaging.
J Magn Reson. 2010 Feb;202(2):239-44. doi: 10.1016/j.jmr.2009.11.004. Epub 2009 Nov 18.
4
8
Multiquantum filters and order in tissues.
NMR Biomed. 2001 Apr;14(2):112-32. doi: 10.1002/nbm.687.
10

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验