Using the boundary condition (as given in Equations 2.74), Equation .73 is solved in terms of V, which is the sum of the solute potential and apparent charge distribution, σ(s) (arises on the boundary between the solute and the solvent) and is given as; which is in-built in the particular version of PCM model . The implementation of the PCM/UAHF model in computational code "Gaussian 03/09" can be invoked using the SCRF keyword in combination with PCM specific modifiers.