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Ultrashort Broadband Cooperative Pulses for Multidimensional Biomolecular NMR Experiments
Author(s) -
Asami Sam,
Kallies Wolfgang,
Günther Johannes C.,
Stavropoulou Maria,
Glaser Steffen J.,
Sattler Michael
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201800220
Subject(s) - excitation , heteronuclear molecule , broadband , nuclear magnetic resonance spectroscopy , magnetic field , bandwidth (computing) , radio frequency , larmor precession , spectroscopy , nuclear magnetic resonance , chemistry , computational physics , physics , optics , computer science , telecommunications , quantum mechanics
NMR spectroscopy at ultra‐high magnetic fields requires improved radiofrequency ( rf ) pulses to cover the increased spectral bandwidth. Optimized 90° pulse pairs were introduced 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 1 H Larmor frequency (23 T). A pair of 30 μs 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 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.