Experimental time saving in NMR measurement of time dependent diffusion coefficients

In this Letter, we describe a simplification of traditional NMR diffusion experiments suitable for the case of time dependent diffusion coefficients. It is shown that by setting the experimental attenuation parameter b=γ2g2δ2td, where td is the diffusion time, to a fixed value, it is possible to observe the characteristic variation of the normalized echo amplitude in restricted diffusion conditions and to construct the experimental curve D(td)/D0 without actually performing all the measurements of the diffusion coefficient at the various times. This yields dramatic experimental time reduction.