Two-Pulse Phase Modulation Based Decoupling Schemes for Removing Heteronuclear Spin Interactions in the NMR Spectroscopy of Isotropic Systems: An Analysis Using Experiments and Numerical Simulations

Autor:	Cyril Augustine
Rok vydání:	2014
Předmět:	Article Subject Chemistry Isotropy Analytical chemistry Nuclear magnetic resonance spectroscopy Decoupling (cosmology) Molecular physics Sweep frequency response analysis lcsh:Chemistry Magnetization lcsh:QD1-999 Heteronuclear molecule lcsh:QC350-467 Anisotropy Phase modulation lcsh:Optics. Light
Zdroj:	International Journal of Spectroscopy, Vol 2014 (2014)
ISSN:	1687-9457 1687-9449
DOI:	10.1155/2014/641473
Popis:	Heteronuclear spin interactions in solids and anisotropic liquids can be removed by phase modulated decoupling sequences with frequency sweep, such as SWf-TPPM and its variants. The performance of these sequences in isotropic spin systems with regard to the experimental parameters, phase angle, and decoupler offset is presented here. A comparison is made with other commonly used heteronuclear decoupling schemes in liquids, namely, WALTZ-16, GARP, and MLEV. Also, the trajectories of nuclear magnetization vector of abundant nuclei in a simple spin system during TPPM and SWf-TPPM decoupling sequences are traced out using computer simulations.
Databáze:	OpenAIRE
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