期刊
JOURNAL OF MAGNETIC RESONANCE
卷 192, 期 1, 页码 151-158出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2008.02.007
关键词
ultrafast 2D NMR; J-resolved spectroscopy; sensitivity; molecular diffusion; homonuclear couplings
Recent ultrafast techniques make it possible to obtain nD NMR spectra in a single scan. However, an important sensitivity decrease is observed when the excitation duration is increased, which is necessary to improve resolution. A detailed, theoretical and experimental study of sensitivity losses in ultrafast experiments is carried out on the example of J-resolved spectroscopy. The importance of molecular diffusion effects during both encoding and acquisition phases is shown by numerical simulations and experimental results. Other possible sources of signal-to-noise decrease are also considered, such as transverse relaxation, homonuclear J-couplings or chemical shift effects. (C) 2008 Elsevier Inc. All rights reserved.
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