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  Method (i):
Refitting the original Charge-Equilibration (QE) method:

where the parameters obey the QE rules:

Method (ii):
A variant of the molecular mechanics (MM) method:

where a fixed split-charge is placed on each type of bond.

Method (iii):
A combination of the AACT method of Chelli et. al and the QE method:

where parameters obey the QE rules except for the bond hardness which is
a pure bond term.

Method (iv):
An extension of method (iii) where perturbations are added:


The Delta perturbations are not taken to be symmetric.
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