hi David A one-component plasma (OCP) is a system in which a single species of charged particle moves in a uniform backround of the opposite charge. Systems of this nature exist in the dense stellar matter of white-dwarf stars. when the screening parameter of the screened Coulomb goes to zero then we have the Coulombic one-component plasma you are right , in gromacs 3.3.1 , it is possible to use a uniform neutralizing backround in PME to compensate for a system with a net backround charge. it is not necessary to add counterions to neutralize the system. thank you very much
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