Fig. 5
Semi logarithmic plot of the intermediate scattering function of iron free Lf (symbols) for three exemplary Q-values, displaced by a factor of 1.5 and 0.75 for better visibility. The dotted lines show the initial slope as obtained by D1 of a cumulant fit according to exp[−Q2(D1t + D2t2)], the solid lines show the long time slope from a single exponential fit for long times only, both extrapolated over the whole time range as single exponentials