研究目的
Investigating the effects of removing z filter components in the REINE pulse sequence on the sensitivity of J coupling measurements in disordered solids.
研究成果
The removal of the first z filter increases the sensitivity of the REINE experiment by a factor of ～1.1–2.0. For systems with broad isotropic chemical shift distributions, the second z filter can also be removed, providing an additional √2 gain in sensitivity. The J couplings determined by fitting the intensity modulations of REINE experiments carry an uncertainty of 0.2–1.0 Hz.
研究不足
The study is limited to simulations and does not include experimental validation. The applicability of the findings to systems with very narrow chemical shift distributions is not fully explored.
1：Experimental Design and Method Selection:
The study employs a product operator analysis and fits to density matrix simulations to investigate the effects of removing z filters in the REINE pulse sequence.
2：Sample Selection and Data Sources:
Simulations are performed for sets of three dipolar coupled 31P nuclei with different isotropic chemical shifts.
3：List of Experimental Equipment and Materials:
The simulations are conducted using SIMPSON
4：1 software. Experimental Procedures and Operational Workflow:
Different versions of the REINE NMR experiment are simulated for various values of τj, with and without z filters.
5：Data Analysis Methods:
The evolution under the scalar coupling of each point in the resulting spectra is fit using custom-written Python scripts and Gnuplot.
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