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Double-quantum excitation in the NMR of spinning solids by pulse-assisted rotational resonance

Double-quantum excitation in the NMR of spinning solids by pulse-assisted rotational resonance
Double-quantum excitation in the NMR of spinning solids by pulse-assisted rotational resonance
We describe a new technique for double-quantum excitation in magic-angle-spinning NMR of powdered solids. The technique is designed to efficiently excite double-quantum coherence in the vicinity of a rotational resonance condition. The offset from rotational resonance allows the double-quantum filtered signals to be observed with high resolution and sensitivity.
The method uses rotational excitation of zero-quantum coherence, assisted by radiofrequency pulse cycles. The zero-quantum coherence is converted into double-quantum coherence by a frequency-selective inversion sequence.
Experiments on [13C2, 15N]-glycine demonstrate a double-quantum filtering efficiency of 41% at a sample rotation frequency of 8.300 kHz, which is 1.600 kHz away from the n = 1 rotational resonance.
We achieve 32% double-quantum filtering efficiency at a spinning frequency of 9.250 kHz, which is 2.550 kHz away from rotational resonance.
multiple-quantum coherence, double-quantum coherence, zero-quantum coherence, rotational resonance, spin echoes, magic-angle spinning
238-247
Karlsson, T.
e55ac446-3a69-47b9-aeda-7645bc778a90
Hughes, C.E.
f4becaa2-b61d-4be6-a28e-58d4e2008f0e
Schmedt auf der Günne, J.
eaf943e5-c2ee-4e15-992c-c99abd604e75
Levitt, M.H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Karlsson, T.
e55ac446-3a69-47b9-aeda-7645bc778a90
Hughes, C.E.
f4becaa2-b61d-4be6-a28e-58d4e2008f0e
Schmedt auf der Günne, J.
eaf943e5-c2ee-4e15-992c-c99abd604e75
Levitt, M.H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3

Karlsson, T., Hughes, C.E., Schmedt auf der Günne, J. and Levitt, M.H. (2001) Double-quantum excitation in the NMR of spinning solids by pulse-assisted rotational resonance. Journal of Magnetic Resonance, 148 (2), 238-247. (doi:10.1006/jmre.2000.2243).

Record type: Article

Abstract

We describe a new technique for double-quantum excitation in magic-angle-spinning NMR of powdered solids. The technique is designed to efficiently excite double-quantum coherence in the vicinity of a rotational resonance condition. The offset from rotational resonance allows the double-quantum filtered signals to be observed with high resolution and sensitivity.
The method uses rotational excitation of zero-quantum coherence, assisted by radiofrequency pulse cycles. The zero-quantum coherence is converted into double-quantum coherence by a frequency-selective inversion sequence.
Experiments on [13C2, 15N]-glycine demonstrate a double-quantum filtering efficiency of 41% at a sample rotation frequency of 8.300 kHz, which is 1.600 kHz away from the n = 1 rotational resonance.
We achieve 32% double-quantum filtering efficiency at a spinning frequency of 9.250 kHz, which is 2.550 kHz away from rotational resonance.

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More information

Published date: 2001
Keywords: multiple-quantum coherence, double-quantum coherence, zero-quantum coherence, rotational resonance, spin echoes, magic-angle spinning

Identifiers

Local EPrints ID: 27755
URI: http://eprints.soton.ac.uk/id/eprint/27755
PURE UUID: f6ed3050-7557-4e4f-a386-5cfe91ee791f
ORCID for M.H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180

Catalogue record

Date deposited: 26 Apr 2006
Last modified: 20 Jul 2019 01:06

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