||"In these simulations, the counterions are explicitly treated. All charged particles interact via the Coulomb potential uij(r)=qiqjkBT?/r, (eq. 10) where qi is the charge on particle i and the Bjerrum length in water is ?=7.1Å. Water is treated as a uniform dielectric background." See Micka et al., 1999 DOI: 10.1021/la981191a p.4034 left column bottom paragraph:"The Bjerrum length is a measure of the strength of the
electrostatic interaction, which is defined as the length at which the electrostatic energy equals the thermal energy."