期刊
JOURNAL OF MAGNETIC RESONANCE
卷 184, 期 1, 页码 39-43出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2006.09.016
关键词
C-13/N-14 correlation; HMQC; dipolar recoupling; MAS; rotary resonance; REDOR
A two-dimensional C-13/N-14 heteronuclear multiple quantum correlation (HMQC) experiment using dipolar recoupling under magic-angle spinning (MAS) is described. The experiment is an extension of the recent indirect C-13 detection scheme for measuring N-14 quadrupolar coupling under MAS. The recoupling allows the direct use of the much larger dipolar interaction instead of the small J and residual dipolar couplings for establishing C-13/N-14 correlations. Two recoupling methods are incorporated into the HMQC sequence, both applying rf only to the observed C-13 spin. The first one uses the REDOR sequence with two pi-pulses per rotor cycle. The second one uses a cw rf field matching the spinning frequency, known as rotary resonance. The effects of CSA, T'(2) signal loss, MAS frequency and stability and t(1)-noise are compared and discussed. (c) 2006 Elsevier Inc. All rights reserved.
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