✦ LIBER ✦
Efficiency of Homonuclear Hartmann–Hahn and COSY-Type Mixing Sequences in the Presence of Scalar and Residual Dipolar Couplings
✍ Scribed by Frank Kramer; Steffen J. Glaser
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 303 KB
- Volume
- 155
- Category
- Article
- ISSN
- 1090-7807
No coin nor oath required. For personal study only.
✦ Synopsis
In the presence of scalar (J) and residual dipolar (D) couplings, the transfer efficiency of homonuclear Hartmann-Hahn and COSYtype mixing depends on the ratio D/J and on the mixing sequence. This dependence is analyzed theoretically and the results are confirmed experimentally. At least two different mixing sequences are required to yield good transfer efficiencies for all ratios D/J. In contrast to COSY-type experiments, homonuclear Hartmann-Hahn sequences can provide efficient transfer even if the sum of D and J is zero, i.e., if the coupling vanishes in the weak coupling limit.