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We calculate the effective force between two oppositely charged and similarlycharged ions fixed in water as a function of separation distance R. At shortseparations, R less than 1 nm, the effective force is vastly different from the$1/{\epsilon}_{s}R^2$ dependence advocated by the screened Coulomb force law(SCFL); ${\epsilon}_{s}$ being the static dielectric constant of the medium. Wealso find an interesting asymmetry in the force between +ve and -ve ions. Thisbreakdown of SCFL is shown to be due to the persistent interference between thepolarizations created by the two charges, in a manner similar to thevortex-antivortex pair formation in XY model Hamiltonian. The distancedependence of dielectric constants, ${\epsilon}_{s}$(R) extracted from oursimulation exhibit interesting features and can be used in future modelling.

Interference effects between ion induced solvent polarisations in Liquid water