2019/01/18 by Puja Banerjee, Biman Bagchi, Banerjee, Puja +1
Chemistry · Physics and Astronomy · #Atomic and Molecular Physics #FOS: Physical sciences #Mass Spectrometry Techniques and Applications #Soft Condensed Matter (cond-mat.soft) #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.1901.06159
openalex publication_date 2019/01/18 · openalex created_date 2022/07/30 · openalex updated_date 2026/07/28
We calculate the effective force between two oppositely charged and similarly\ncharged ions fixed in water as a function of separation distance R. At short\nseparations, R less than 1 nm, the effective force is vastly different from the\n1/\εsR2 dependence advocated by the screened Coulomb force law\n(SCFL); \εs being the static dielectric constant of the medium. We\nalso find an interesting asymmetry in the force between +ve and -ve ions. This\nbreakdown of SCFL is shown to be due to the persistent interference between the\npolarizations created by the two charges, in a manner similar to the\nvortex-antivortex pair formation in XY model Hamiltonian. The distance\ndependence of dielectric constants, \εs(R) extracted from our\nsimulation exhibit interesting features and can be used in future modelling.\n