Figure 1
From: A new perspective of molecular diffusion by nuclear magnetic resonance
PFG and anomalous diffusion. Panel (a) A schematic representation of the couple of magnetic field gradients in PFG-based sequence. Panel (b) Integral function F(t) of the gradient in panel (a). Panel (c) phase accumulating during the gradient pulses: the same scheme has been used to obtain the DW-NMR signal from stochastic trajectories (see “Methods” section). Panel (d) Expected behavior of the derivative of the logarithm of the normalized echo amplitude for different values of the anomalous diffusion exponent \(\alpha\). For subdiffusive processes the derivative is a decaying function of \(\Delta\), for superdiffusive processes it is an increasing function, whilst for normal diffusing systems it is constant.
