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Fourier transform of the stretched exponential model, a.k.a. molasses tail or Kohlrausch-Williams-Watts (KWW) model #49

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@tovrstra

Another example showing that it is practically impossible to come up with something nobody else has done before:

https://doi.org/10.1039/TF9706600080

Apparently, for some exponents, here exp(-(t/t0)^(1/2)), the analytical FT can be derived. I'm not sure yet how relevant this specific case is, and whether it is worth and possible to include them in ACID 2. To be discussed.

This type of model is popular for modeling ACFs of slowly decaying processes, but typically with fitted exponents, not just 1/2. Some examples, mostly related to viscosity, but also for other relaxation processes:

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