Long time tail effect in liquid state NMR spectroscopy

Abstract

Experimental evidence of long time tail effect in liquid state NMR spectroscopy has been observed, characterized and its potential applications proposed. It is found that the physical mechanism for the long time tail of the spin auto-correlation function in the liquid state is similar to, but not identical with, that in the solid state. The net effect is shown that the decaying function t − d ′/2 where d ′< d (the dimension of the spin network), which is clearly more desirable for its applications. Particularly significant to the applications to the enhancement of resolution is that decaying slower than t − d/2 can be achieved, indicating better resolution improvement can be achieved than in the solid state. Extensive exposure of the characteristics of this phenomenon is provided with a number of model compounds and tentative theoretical analysis is given.