10.3929/ETHZ-B-000439839
Aebischer, Kathrin
Wili, Nino
Tošner, Zdeněk
Ernst, Matthias
Using nutation-frequency-selective pulses to reduce radio-frequency field inhomogeneity in solid-state NMR
ETH Zurich
2020
Journal Article
2020
en
application/pdf
Creative Commons Attribution 4.0 International
info:eu-repo/semantics/openAccess
Radio-frequency (rf) field inhomogeneity is a common problem in NMR which leads to non-ideal rotations of spins in parts of the sample. Often, a physical volume restriction of the sample is used to reduce the effects of rf-field inhomogeneity, especially in solid-state NMR where spacers are inserted to reduce the sample volume to the centre of the coil. We show that band-selective pulses in the spin-lock frame can be used to apply B1-field selective inversions to spins that experience selected parts of the rf-field distribution. Any frequency band-selective pulse can be used for this purpose, but we chose the family of I-BURP pulses (Geen and Freeman, 1991) for the measurements demonstrated here. As an example, we show that the implementation of such pulses improves homonuclear frequency-switched Lee–Goldburg decoupling in solid-state NMR.
Magnetic Resonance, 1 (2)
ISSN:2699-0016