title: Rapid encoding of T(1) with spectral resolution in n-dimensional relaxation correlations.
abstract: 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 rock. A novel T(1)-T(1)-(delta) relaxation exchange measurement is also introduced and used to observe diffusive exchange of water in cellulose fibres.
authors.affiliation: Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge, Cambridgeshire CB2 3RA, United Kingdom.
authors.forename: T C
authors.initials: TC
authors.lastname: Chandrasekera
authors.forename: J
authors.initials: J
authors.lastname: Mitchell
authors.forename: E J
authors.initials: EJ
authors.lastname: Fordham
authors.forename: L F
authors.initials: LF
authors.lastname: Gladden
authors.forename: M L
authors.initials: ML
authors.lastname: Johns
mesh_terms: D000465:Algorithms; D002482:Cellulose / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted
chemical_list: D002482:Cellulose