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Broadband excitation pulses for high‐field solid‐state nuclear magnetic resonance spectroscopy
Author(s) -
Loening Nikolaus M.,
Rossum BarthJan,
Oschkinat Hartmut
Publication year - 2012
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.3800
Subject(s) - excitation , spectroscopy , chemistry , magic angle spinning , solid state nuclear magnetic resonance , nuclear magnetic resonance , atomic physics , spinning , pulse (music) , resonance (particle physics) , spectrometer , magnetic field , nuclear magnetic resonance spectroscopy , optics , physics , detector , quantum mechanics , polymer chemistry
In nuclear magnetic resonance spectroscopy, experimental limits due to the radiofrequency transmitter and/or coil means that conventional radiofrequency pulses (“hard pulses”) are sometimes not sufficiently powerful to excite magnetization uniformly over a desired range of frequencies. Effects due to nonuniform excitation are most frequently encountered at high magnetic fields for nuclei with a large range of chemical shifts. Using optimal control theory, we have designed broadband excitation pulses that are suitable for solid‐state samples under magic‐angle‐spinning conditions. These pulses are easy to implement, robust to spinning frequency variations, and radiofrequency inhomogeneities, and only four times as long as a corresponding hard pulse. The utility of these pulses for uniformly exciting 13 C nuclei is demonstrated on a 900 MHz (21.1 T) spectrometer. Copyright © 2012 John Wiley & Sons, Ltd.