Understanding radiation damping in a simple way

✍ Scribed by Mao, Xi-An ;Ye, Chao-Hui

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 244 KB
• Volume: 9
• Category: Article
• ISSN: 1043-7347
• DOI: 10.1002/(sici)1099-0534(1997)9:3<173::aid-cmr4>3.0.co;2-w

✦ Synopsis

A simple picture is provided about various radiation-damping effects in NMR, as follows: free-induction decay can grow before it decays; signal intensity shows a sawtooth profile as a function of the pulse flip angle; a twisted signal phase can appear when the pulse flip angle is greater than 90Њ; spin ᎐ lattice relaxation times cannot be measured by the routine inversion ᎐ recovery method, and spin ᎐ spin relaxation times cannot be estimated by the simple spin ᎐ echo method; a z gradient pulse sometimes fails to suppress radiation damping; and in two-dimensional experiments there can be strong harmonic peaks in the indirectly detected dimension.