Fig. 2

Normalized diffusion coefficient D/D ₀, computed with Eqs. (23) and (25), for A-type particles vs. intermolecular average distance d of B-type particles (expressed in adimensional units). The B-particles interact through a Coulombic potential \(U_{Coul}=\bar {\mathcal {C}}l^{-1}\). Conventions on units are the same of Fig. 1. The curves refer to the fixed value Γ=0.01 of the friction coefficient, and to different values of the potential strength: \(\,\bar {\mathcal {C}}_{Coul}=10^{2}\) (continuous line), \(\,\bar {\mathcal {C}}_{Coul}=10^{3}\) (dot-dashed line), \(\,\bar {\mathcal {C}}_{Coul}=10^{4}\) (dashed line), \(\,\bar {\mathcal {C}}_{Coul}=10^{5}\) (dotted line). The case of \(\bar {\mathcal {C}}_{Coul}=0\) has been reported (black dot dashed line)