NMR chemical shift anisotropy measurements by RF driven rotary resonance
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DESPERATE: A Python library for processing and denoising NMR spectra
2023, Journal of Magnetic ResonanceReducing the effects of weak homonuclear dipolar coupling with CPMG pulse sequences for static and spinning solids
2022, Journal of Magnetic ResonanceCitation Excerpt :On a side note, we did not observe analogous homonuclear dipolar coupling effects in our previous study featuring CPMG-MAS NMR experiments on spin-1/2 nuclei such as 119Sn (n.a. = 8.6 %), 195Pt (n.a. = 33.8 %), and 207Pb (n.a. = 22.1 %); this is likely due to both a reduced number of homonuclear dipolar couplings and smaller νDeff arising from the combination of lower natural abundances of these isotopes and increased nuclear distances.[58] In addition, homonuclear recoupling by the n = 0 R2 condition requires frequency differences arising from the CSA, the contributions of which to the powder pattern are is modulated by MAS.[51] Observations of augmented T2eff’s similar to those reported in the current work were reported by Cowans and Grutzner for rotor-synchronized 1H–13C CP-CPMG experiments in which different composite pulse widths for refocusing were compared;[79] however, the effects of homonuclear dipolar couplings were not discussed.
Refocusing CSA during magic angle spinning rotating-frame relaxation experiments
2018, Journal of Magnetic ResonanceCitation Excerpt :However, in these experiments magnetization undergoes significant coherent evolution that depends on the details of MAS, the spin-lock field, and chemical shift anisotropy (CSA). As a consequence of the coherent evolution, the magnetization exhibits oscillations [25], with distorted spinning sideband intensities [26], leading to difficulties in the characterization of the motion by analyses of relaxation rates [5]. The effects of the coherent evolution of 15N relaxation when ωr > δ, (where δ describes the magnitude of the CSA), is typically not as prominent, which allows studies of 15N relaxation to continue relatively unimpeded in contrast with 13C relaxation for carbons with relatively large CSA.
Broadband adiabatic inversion cross-polarization phenomena in the NMR of rotating solids
2018, Solid State Nuclear Magnetic ResonanceMeasurement of proton chemical shift anisotropy in solid-state NMR spectroscopy
2018, Solid State Nuclear Magnetic ResonanceCitation Excerpt :The measurement can be done by extracting the CSA lineshapes in the indirect dimension of a 2D NMR experiment where an rf irradiation with v1 = nvR is applied during t1. Using the rotary resonance method, 13C CSA parameters of hexamethylbenzene and calcium formate were acquired by Gan et al. in 1996.[70] In that case high power 1H decoupling was used during t1 while rotary resonance irradiation was applied on 13C.