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Coherence Selection and Excitation Sculpting Using RF-Gradients in Selective 1D Experiments and Nonselective 2D Experiments

✍ Scribed by Sami Heikkinen; Erkki Rahkamaa; Ilkka Kilpeläinen

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 158 KB
Volume: 133
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1456

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✦ Synopsis

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 selective 1D and nonselective 2D TOCSY and NOESY experiments. The spectral quality obtained with the RF-gradient method was comparable to that of the B 0 method for small-to medium-sized molecules. There are also some advantages in using RF-gradients instead of B 0 gradients. There is practically no shift or coupling evolution during RF-gradient pulses. This may be significant in some experiments.

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