Laplace inversions applied to multi–component T2–T2 exchange experiments

Abstract

Two-dimensional (2D) T₂-T₂ molecular exchange NMR experiments with a period of magnetization storage between the two T₂ relaxation encoding periods are presented. The two-dimensional time map was inverted using a fast Laplace algorithm to obtain the T₂–T₂ exchange map. T₂–M_Z(store)–T₂ 2D ¹H NMR spectra recorded at high and low homogeneous magnetic fields of water and oil in sand, air bubbles in water and foams, exchange of liquid / foam and liquid / saturated vapours of chloroform are presented. Uni– and bi–directional exchange was observed for bubbles in water, superficial liquid shell, and foam.