Journal of Magnetic Resonance (1969)
Comparisons of quadrature and single-phase fourier transform NMR
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Cited by (121)
40 yrs CPMAS & 25 yrs REDOR
2015, Solid State Nuclear Magnetic ResonanceDAC-board based X-band EPR spectrometer with arbitrary waveform control
2013, Journal of Magnetic ResonanceCitation Excerpt :However, it is well known that phase cycling can effectively eliminate instrumental imperfections. For instance, if the two quadrature detection channels are not precisely 90° out of phase with each other or have different sensitivities, a negative frequency mirror peak appears in the Fourier transform of the FID [42]. As shown in Fig. 6, when an FID signal is acquired with a 4-step phase cycle, the phase cycling provided by the spectrometer successfully removes the artifactual mirror peak that occurs in the Fourier transform of the FID.
Baseline correction of absorption-mode Fourier transform ion cyclotron resonance mass spectra
2012, International Journal of Mass SpectrometryCitation Excerpt :Accurate isotopic distributions are particularly important for identification and structural characterization of biomacromolecules [4,5] because accurate determination of protein and peptide molecular mass requires correct fit of the isotopic distribution [6]. Baseline roll is also a major problem in Fourier transform nuclear magnetic resonance (FT NMR) [7–10], resulting from foldback of dispersive wings from phase correction [9], nonlinear filter response [11], improper weighting of the initial part of the time-domain data [12], the discrete nature of the fast Fourier transform, and instrumental instabilities [13,14]. Baseline roll in FT NMR can be reduced by experimental optimization of acquisition parameters [10], oversampling [15], and digital signal processing [16], or by post-processing methods, such as reconstruction of the initial time-domain data [14,17].
Optimized NMR spectroscopic strategy to characterize water dynamics in soil samples
2011, Organic GeochemistryExact solution to the Bloch equations and application to the Hahn echo
2010, Journal of Magnetic ResonanceCitation Excerpt :If phase cycling is applied in the experiment, the effective matrix Exp(Aπ) will be the average of the effective matrices for all phases. Eqs. (C.5) and (D.1) show that phase cycling of ±x can be used to make the constant term c4 of Eq. (15) zero and c1, c2 and c3 independent of the z magnetization which means that the effect of the longitudinal magnetization on the transverse magnetization within a square pulse is eliminated, see also [51,52], this may be helpful to improve the sensitivity of the spectra [53] and the accuracy of the measurements of R1 and R2 by 5–15% over the case where the constant term is not included in the data analysis [51], and complete the coherence selection [54]. In Appendix D, Mt is calculated with phase cycling or different phases with exact and approximate solutions of the Bloch equations.
Spectral editing of weakly coupled spins using variable flip angles in PRESS constant echo time difference spectroscopy: Application to GABA
2009, Journal of Magnetic Resonance