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Gradient selection of coherences in experiments with carbon detection

✍ Scribed by Wieland Willker; Dieter Leibfritz

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
323 KB
Volume
32
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

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.

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Coherence Selection and Excitation Sculpting Using RF-Gradients in Selective 1D Experiments and Nonselective 2D Experiments
✍ Sami Heikkinen; Erkki Rahkamaa; Ilkka Kilpeläinen 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 158 KB

The B 0 gradient pulses can be replaced with long high-power pulses (RF-gradients) in z-rotation composite sandwiches. By doing this, practically all B 0 gradient-based pulse sequences can be performed with instruments lacking a field gradient accessory. We have implemented RF-gradients into selecti