[1289.3.1] Two fractional relaxation models (model A and model B) were shown
to fit broad band dielectric spectroscopy data for various glass forming
materials.
[1289.3.2] For 5-methyl-2-hexanol and methyl-m-toluate the 3-parameter model A
can fit data over a range of 6 and 7 orders of magnitude.
[1289.3.3] Generally we observed good fits over
a range of at least 5 orders of magnitude for model A and 10 orders
of magnitude for model B.
[1289.3.4] Conventional fitting formulae (such as Havriliak-Negami and Cole-Cole)
require 6 parameters in contrast to 3 for model A resp. 4 for model B.
[1289.3.5] In summary, this work has given
closed form analytical expressions for excess wings
containing only three (or four) parameters, that
are derived from the previously introduced method
of composite fractional time evolutions
[17, 18] and are
directly applicable to experiment.
