A Fully Rotating Electrostatic Model

Clearly, these models are quite far from any of the real molecules. We have chosen to develop these simplified models for two reasons first, to show how the direct and indirect parts of the correlation are interwoven in such a way that there is no way of factorizing these two parts second, to prepare the basic building block for the more elaborate model discussed in the next subsection. 

The PFs of these molecules are constructed from the following elements  

The internal energy of the molecule is taken as the sum of three terms, all depending on the angle [), 

The binding energies of the proton with charge (= +e) to the two sites are 

With this description of the model we have adjusted the two dielectric constants D( = 55 and Dj. = 78 to compute the correlation functions of the three model compounds. 

---