Phase-shift presaturation in one- and two-dimensional NMR experiments

✍ Scribed by Xi-an Mao; Chao-hui Ye

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 441 KB
• Volume: 227
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)00862-0

✦ Synopsis

A simple and efficient technique, called phase-shift presaturation, for solvent suppression in one-and two-dimensional NMR experiments is proposed and tested. The solvent signal can he considerably suppressed when the traditional presaturation technique is modified by a a/2 shift of the rfphase during low-power irradiation. The long pulse is thus divided into two periods. In the first period, which is much longer than the second one, first-order suppression is achieved, but some residual of the magnetization is spin-locked. The spin-locked components can, however, be largely suppressed in the second period with an orthogonal rf phase.