Fig. 4

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-type particles interact through the Coulombic screened potential given in (50). Conventions on adimensional units are the same of Fig. 1. The curves refer to different choices of the value of the friction coefficient Γ and of the screening length λ _D =10 which set the strength of the potential energy: \(\,\Gamma =0.05 \,\,\text {and}\,\, \bar {\mathcal {C}}_{CoulScr}=10^{2}\) (blue continuous line), \(\,\Gamma =0.05\,\,\text {and}\,\, \bar {\mathcal {C}}_{CoulScr}=10^{6}\) (orange dot-dashed line), \(\,\Gamma =0.01\,\,\text {and}\,\, \bar {\mathcal {C}}=10^{2}\) (green dashed line), \(\,\Gamma =0.01\,\,\text {and}\,\, \bar {\mathcal {C}}_{CoulScr}=10^{6}\) (red dotted line). The case of \(\bar {\mathcal {C}}_{CoulSCr}=0\) has been reported (black dot dashed line) for Γ=0.05