Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum Effects (QED) I
Q 38.5: Talk
Wednesday, March 11, 2020, 15:00–15:15, f442
Attractive force between equally-charged ions — •Johannes Fiedler1 and Stefan Yoshi Buhmann1,2 — 1University of Freiburg, Freiburg, Germany — 2Freiburg Institute for Advanced Studies, Universität Freiburg, Freiburg, Germany
The multipole expansion of the electric field for an ion yields the charge, dipole, quadrupole and higher order contributions [1]. Beyond these classical interactions, fluctuations of these quantities play a role when considering interactions between such particles, which manifest in the forms of the van der Waals and Keesom forces [2]. Typically, the Coulomb interaction dominates the total force. The dominating effect upon adding an environmental medium is the damping of the interaction caused by its refractive index. This screening depends on the spectrum of the medium, which leads to differing orders of dominant interactions. We will present a theory of medium-assisted intermolecular interactions [3] and illustrate scenarios where the higher order forces dominate the Coulomb interactions.
[1] J. D. Jackson, Classical electrodynamics, 3rd ed. (Wiley, New York, NY, 1999).
[2] J.N. Israelachvili, Intermolecular and Surface Forces, 3rd ed. (Academic Press, Waltham, MA, 2011).
[3] J. Fiedler, S.Y. Buhmann, submitted to PCCP (2019).