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 language | English (US) |
---|---|
Pages (from-to) | 15-24 |
Number of pages | 10 |
Journal | Journal of Magnetic Resonance |
Volume | 287 |
DOIs | |
State | Published - Feb 2018 |
Keywords
- Delayed-acquisition
- Fourier series
- Interfaces
- Line narrowing
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Nuclear and High Energy Physics
- Condensed Matter Physics