Havriliak-Nagami equation

Neither the a-process nor the normal mode equal a single-time relaxation process. A good representation of data is often achieved by use of the empirical Havriliak-Nagami equation which has the form... 

Further contributions with minor weights originate from the subsequent Rouse-modes with m > 1. They may lead to the observed line-broadening on the high frequency side, as described empirically by the Havriliak-Nagami equation. 

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See also in sourсe #XX -- [ ]

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