Suppression of Radiation Damping in High-Resolution NMR

✍ Scribed by Hervé Barjat; Debra L. Mattiello; Ray Freeman

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 46 KB
• Volume: 136
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1998.1613

✦ Synopsis

The radiation damping field induced by an intense NMR line can be counterbalanced by a DANTE sequence of small flip angle pulses of opposite phase applied during the free induction decay. The transient NMR signal is acquired, one complex data point at a time, in the intervals between these DANTE pulses. As the intense signal decays, reducing the radiation damping field, the flip angles of the DANTE pulses are reduced at a matching rate. An experimental test on an aqueous solution of D-glucose demonstrates a reduction in linewidth at half height from 13.5 to 0.8 Hz, revealing a weak doublet response previously hidden under the broad water line.