Thank you very much. I managed meanwhile to run the simulation with K+ by adding
<<<K+ 19 0.000 0.000 A 1.638e-05 1.184e-06>>> to my ffnonbonded.itp I took c6 and c12 parameters (I use gromos 53a6) from Table I of Effect of Force Field Parameters on Sodium and Potassium Ion Binding to Dipalmitoyl Phosphatidylcholine Bilayers ' As far as I understand, it is sufficient to add this (and only this line) line, right ? Thank you very much again. Best Markus
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