The influence of the radiofrequency excitation and conversion pulses on the lineshapes and intensities of the triple-quantum MAS NMR spectra of I = 3/2 nuclei

Amir Goldbourt*, Shifi Kababya, Shimon Vega, P. K. Madhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

A rigorous examination of the various multiple-quantum magic angle spinning sequences is carried out with reference to sensitivity enhancement in the isotropic dimension and the lineshapes of the corresponding MAS peaks in the anisotropic dimension. An echo efficiency parameter is defined here, which is shown to be an indicator of the performance aspects of the various sequences. This can be used in the design of further new experiments in this field. A consequence of such a systematic analysis has been the combination of a spin-lock pulse for excitation of multiple-quantum coherences and an amplitude-modulated pulse for their conversion to observable single-quantum coherences. This approach has resulted in an improved performance over other sequences with respect to both the anisotropic lineshapes and the isotropic intensities.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalSolid State Nuclear Magnetic Resonance
Volume18
Issue number1-4
DOIs
StatePublished - Aug 2000
Externally publishedYes

Funding

FundersFunder number
United States-Israel Binational Science Foundation
Austrian Science FundM531-CHE

    Keywords

    • MQMAS
    • Solid state NMR

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