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Default Ultrashort Broadband Cooperative Pulses for Multidimensional Biomolecular NMR Experiments.

Ultrashort Broadband Cooperative Pulses for Multidimensional Biomolecular NMR Experiments.

Related Articles Ultrashort Broadband Cooperative Pulses for Multidimensional Biomolecular NMR Experiments.

Angew Chem Int Ed Engl. 2018 Mar 05;:

Authors: Asami S, Kallies W, GŘnther J, Stavropoulou M, Glaser S, Sattler M

Abstract
NMR spectroscopy at ultra-high magnetic fields requires improved radiofrequency (rf) pulses to cover the increased spectral bandwidth. We introduce optimized 90░ pulse pairs as Ramsey-type cooperative (Ram-COOP) pulses for biomolecular NMR applications. The Ram-COOP element provides broadband excitation with enhanced sensitivity and reduced artifacts even at magnetic fields >1.0 GHz 1H Larmor frequency (23 T). A pair of 30 ?s Ram-COOP pulses achieves an excitation bandwidth of 100 kHz with a maximum rf field of 20 kHz, more than three-fold improved compared to achievable excitation by rectangular pulses. Ram-COOP pulses exhibit little offset-dependent phase errors and are robust to rf inhomogeneity. The performance of the Ram-COOP element is experimentally confirmed with heteronuclear multidimensional NMR experiments, applied to proteins and nucleic acids. Ram-COOP provides broadband excitation at low rf field strength suitable for application at current magnetic fields and beyond 23 T.


PMID: 29508496 [PubMed - as supplied by publisher]



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