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Effects of Instrumental Artifacts on Double-Quantum-Filtered NMR Buildup Curves for Spin \(I=1\)

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Abstract

We report on the effects of several commonly encountered instrumental artifacts on the buildup curves from a double-quantum-filtered nuclear magnetic resonance (NMR) pulse sequence for spin \(I=1\) nuclei. In this work, the artifacts of finite pulse widths, radio frequency field inhomogeneity and pulse transients are studied. The buildup curves are calculated by numerically simulating the evolution of the spin density matrix under the Hamiltonian designed for the artifacts, and are then fit to a bi-exponential equation. The results indicate a clear deviation of the bi-exponential time constants characterizing the buildup curves under certain artifacts, compared with the situation where no artifacts are present. This work shows that the presence of instrumental artifacts may cause a misunderstanding of the buildup curves in experiments, and in turn, the chemical environments that the nuclei experience. We suggest that one optimizes the instruments on certain artifacts before performing the double-quantum-filtered NMR experiments.

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Acknowledgments

C. Sun acknowledges support by Grant Number 31400718 from the National Natural Science Foundation of China, and Grant L2012444 from the General Project of Scientific Research of Education Department of Liaoning Province of China.

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Authors and Affiliations

  1. College of Physical Science and Technology, Dalian University, Dalian, China

    Cheng Sun & Zhixiao Wang

  2. College of Environmental and Chemical Engineering, Dalian University, Dalian, China

    Xuefeng Wang

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  1. Cheng Sun
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  2. Xuefeng Wang
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  3. Zhixiao Wang
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Correspondence to Cheng Sun.

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Sun, C., Wang, X. & Wang, Z. Effects of Instrumental Artifacts on Double-Quantum-Filtered NMR Buildup Curves for Spin \(I=1\) . Appl Magn Reson 46, 809–821 (2015). https://doi.org/10.1007/s00723-015-0678-z

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  • DOI: https://doi.org/10.1007/s00723-015-0678-z

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