Rapid encoding of T1 with spectral resolution in n-dimensional relaxation correlations

Nuclear magnetic resonance (NMR) T-1 relaxation times have been encoded in the second dimension of two-dimensional relaxation correlation and exchange experiments using a rapid "double-shot" T-1 pulse sequence. This technique also retains chemical shift information (delta) for short T-2* materials. In this way, a spectral dimension can be incorporated into a T-2-T-1-delta correlation without an increase in experimental time compared to the conventional, chemically insensitive T-1-T-2 correlation. Here, the T-2-T-1-delta pulse sequence is used to unambiguously identify oil and water fractions in a permeable Fock. A novel T-1-T-1-(delta) relaxation exchange measurement is also introduced and used to observe diffusive exchange of water in cellulose fibres. (C) 2008 Elsevier Inc. All rights reserved.