Multiple-quantum relaxation in the magic-angle-spinning NMR of 13C spin pairs. Karlsson, T, Brinkmann, a, Verdegem, P J, Lugtenburg, J, & Levitt, M H Solid state nuclear magnetic resonance, 14(1):43–58, June, 1999. ![Multiple-quantum relaxation in the magic-angle-spinning NMR of 13C spin pairs. [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex We determine the decay rate constants of zero-, double- and single-quantum coherence for 13C spin pairs in magic-angle-spinning solid-state NMR. The double-quantum coherence is excited by a C7 pulse sequence and converted into zero-quantum coherence by a frequency-selective pair of pi/2 pulses. The zero-quantum coherence is reconverted into observable magnetization by a second pair of pi/2 pulses followed by a second C7 sequence. In a magnetically dilute system where the 13C-13C distance is 0.296 nm, the relaxation rate constants are consistent with a model of uncorrelated random fields at the two labeled 13C sites. In a fully-labelled system with a short 13C-13C distance of 0.153 nm, the measured rate constants are inconsistent with the uncorrelated random field model.
@article{Karlsson1999,
title = {Multiple-quantum relaxation in the magic-angle-spinning {NMR} of {13C} spin pairs.},
volume = {14},
issn = {0926-2040},
url = {http://www.ncbi.nlm.nih.gov/pubmed/10408274},
abstract = {We determine the decay rate constants of zero-, double- and single-quantum coherence for 13C spin pairs in magic-angle-spinning solid-state NMR. The double-quantum coherence is excited by a C7 pulse sequence and converted into zero-quantum coherence by a frequency-selective pair of pi/2 pulses. The zero-quantum coherence is reconverted into observable magnetization by a second pair of pi/2 pulses followed by a second C7 sequence. In a magnetically dilute system where the 13C-13C distance is 0.296 nm, the relaxation rate constants are consistent with a model of uncorrelated random fields at the two labeled 13C sites. In a fully-labelled system with a short 13C-13C distance of 0.153 nm, the measured rate constants are inconsistent with the uncorrelated random field model.},
number = {1},
journal = {Solid state nuclear magnetic resonance},
author = {Karlsson, T and Brinkmann, a and Verdegem, P J and Lugtenburg, J and Levitt, M H},
month = jun,
year = {1999},
pmid = {10408274},
keywords = {Carbon Isotopes, Glycine, Glycine: chemistry, Magnetic Resonance Spectroscopy, Magnetic Resonance Spectroscopy: methods, Mathematics, Molecular Structure, Quantum Theory, Retinaldehyde, Retinaldehyde: chemistry, Spectrum Analysis, Spin Trapping},
pages = {43--58},
}
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