Interaction energy difference

From: m.raviprasad_at_ndsu.edu
Date: Wed Jul 28 2010 - 22:42:07 CDT

Hi

I calculated electrostatic interaction between two group of atoms with and
without periodic boundary condition. But the values are different.

Ex: Elec. without PBC = 155 kcal/mol
    Elec. with PBC = 300 kcal/mol

According to the unit of the interaction energy, Interaction energies are
calculated for mole. so Why this difference?

Does any one have an answer.

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