High-resolution NMR with resistive and hybrid magnets: Deconvolution using a field-fluctuation signal

Defeating Radiation Damping and Magnetic Field Inhomogeneity with Spatially Encoded Noise

“…Field fluctuations will affect all of the spectral lines identically and so their effects would appear to be amenable to deconvolution, and in fact deconvolution of such fluctuations has been demonstrated. [25,26] In order to carry out such a deconvolution knowledge of the field as a function of time is required during signal acquisition. Gan et al [25] obtained this information by collecting 1 H and 2 H spectra simultaneously while Iijima et al [26] used the induced electromotive force in a pickup coil.…”

“…[25,26] In order to carry out such a deconvolution knowledge of the field as a function of time is required during signal acquisition. Gan et al [25] obtained this information by collecting 1 H and 2 H spectra simultaneously while Iijima et al [26] used the induced electromotive force in a pickup coil. One of these approaches could be employed here, where each transient would be deconvolved individually before any cross-correlation or other deconvolution steps.…”

High-field NMR using resistive and hybrid magnets

“…Here we describe an alternative approach based on simultaneous acquisition of a reference signal from the solvent deuteron. The effect of field fluctuations on the signal phase is corrected by data processing following the acquisition similar to the reference deconvolution method [20][21][22][23][24].…”

“…A cooled, highly conductive aluminum cylinder has been successfully employed to shield a room temperature sample from field fluctuations to improve the efficiency of signal averaging in relaxation experiments [19]. Other methods based on NMR data collection and processing such as reference deconvolution [9,[20][21][22][23][24] have also been introduced to compensate for field inhomogeneity and fluctuation. In this paper, we present the efforts of improving NMR spectral resolution using powered magnets at the National High Magnetic Field Laboratory (NHMFL) including the development of a field compensating technique that simultaneously acquires the solvent signal.…”

Compensation of effect of field instability by reference deconvolution with phase reconstruction

“…Recently we have reported another method of deconvolution which uses a field-fluctuation signal [6]. In this method an electromotive force signal induced for a pickup coil wound near a sample is measured synchronously with an FID signal.…”