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Average alignment of dipole vectors Pr(r) around Na+ (top) and Cl– (bottom) ions. To allow a judgment on how likely it is to find a dipole at distance r, we also plot the ion-oxygen RDF for the CC force field (gray line). The RDFs for the other force fields are similar. Note that the results for Pr(r) naturally become noisy at distances where the ion-oxygen RDF becomes small. All results are taken from 0.1 M solutions to avoid ion–ion interactions.
