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Use of RF Gradients in Excitation Sculpting, with Application to 2D HSQC

✍ Scribed by Sami Heikkinen; Erkki Rahkamaa; Ilkka Kilpeläinen

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
147 KB
Volume
127
Category
Article
ISSN
1090-7807

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✦ Synopsis

The gradient pulses of double-GBIRD can be replaced with are flipped, the J( 13 C, 1 H) continues evolution after the first high-power spin-lock pulses ( RF gradients ) in z-rotation com-GBIRD cluster. To eliminate this, an inversion pulse for posite sandwiches. Implementation of this double-spin-locked carbons is applied between the two GBIRD clusters. The BIRD ( double-SLBIRD ) in 2D HSQC results in drastic suppressuppression ratio of this double-GBIRD is about 50-200 sion of t 1 noise, nice baseline characteristics, and good dynamic (2,3). This means that after double-GBIRD the parent sigrange. The superior properties of double-SLBIRD-HSQC over nals are only 2-4 times stronger than the satellites. Complete conventional HSQC and even over double-spin-locked HSQC suppression, as in case of quad-GBIRD [suppression ratio for small to medium-sized molecules makes this excitationabout 100 times better than with double-GBIRD (2, 3)], is sculpting approach preferable. However, double-SLBIRD usually not necessary for proton-detected two-dimensional should not be considered as an alternative for double-GBIRD, techniques, as the final suppression of parent signals can be but rather as a substitute for those spectrometers lacking field gradients. ᭧ 1997 Academic Press achieved successfully with phase cycling.

The double-GBIRD-type experiment can be performed by using high-power proton spin-lock pulses on both sides of the BIRD clusters (double-SLBIRD, Fig. 1). In our ap-80

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