Enhancing the detection of edges and non-differentiable points in an NMR spectrum using delayed-acquisition

Zhaoyuan Gong, Jamie Walls

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Delayed-acquisition, which is a common technique for improving spectral resolution in Fourier transform based spectroscopies, typically relies upon differences in T2 relaxation rates that are often due to underlying differences in dynamics and/or complexities of the spin systems being studied. After an acquisition delay, the broad signals from fast T2-relaxing species are more suppressed relative to the sharp signals from slow T2-relaxing species. In this paper, an alternative source of differential “dephasing” under delayed-acquisition is demonstrated that is based solely upon the mathematical properties of the line shape and is independent of the underlying spin dynamics and/or complexity. Signals associated with frequencies where the line shape either changes sharply and/or is non-differentiable at some finite order dephase at a much slower rate than those signals associated with frequencies where the line shape is smooth. Experiments employing delayed-acquisition to study interfaces in biphasic samples, to measure spatially-dependent longitudinal relaxation, and to highlight sharp features in NMR spectra are presented.

Original languageEnglish (US)
Pages (from-to)15-24
Number of pages10
JournalJournal of Magnetic Resonance
Volume287
DOIs
StatePublished - Feb 1 2018

Keywords

  • Delayed-acquisition
  • Fourier series
  • Interfaces
  • Line narrowing

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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