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Gradient selection of coherences in experiments with carbon detection
Author(s) -
Willker Wieland,
Leibfritz Dieter
Publication year - 1994
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.1260321106
Subject(s) - chemistry , coherence (philosophical gambling strategy) , noise (video) , interference (communication) , selection (genetic algorithm) , nuclear magnetic resonance , signal (programming language) , filter (signal processing) , analytical chemistry (journal) , signal to noise ratio (imaging) , computational physics , molecular physics , optics , physics , chromatography , artificial intelligence , image (mathematics) , quantum mechanics , channel (broadcasting) , computer science , electrical engineering , computer vision , programming language , engineering
Coherence pathway selection with gradients in carbon‐detected experiments is demonstrated. Gradient selection (gs) offers excellent suppression of artifacts and unwanted magnetization, and in practice the signal‐to‐noise ratio is at least as good as for the equivalent phase cycled experiment. A selective gs‐1D‐ 13 C‐COSY is used to correlate one carbon resonance with its neighbours. The gs‐INADEQUATE is used to select multi‐quantum coherences; this can be performed as a 1D or a 2D experiment. Complete elimination of t 1 noise is obtained in the gs version only. Applications to labelled glucose, 3‐phenylpropan‐1‐ol and natural abundance menthol are presented. Interference from high‐frequency stray radiation in the gradient cable is removed by inserting a low‐pass filter between the gradient wiring and the probe.