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

Nuclear magnetic resonance (NMR) T1 relaxation times have been encoded in the second dimension of two-dimensional relaxation correlation and exchange experiments using a rapid “double-shot” T1 pulse sequence. This technique also retains chemical shift information (δ) for short T2∗ materials. In this way, a spectral dimension can be incorporated into a T2-T1-δ correlation without an increase in experimental time compared to the conventional, chemically insensitive T1-T2 correlation. Here, the T2-T1-δ pulse sequence is used to unambiguously identify oil and water fractions in a permeable rock. A novel T1-T1-(δ) relaxation exchange measurement is also introduced and used to observe diffusive exchange of water in cellulose fibres.