To PME , Do the simulation need a neutral charged system?

From: mashaojie163 (
Date: Tue Sep 21 2004 - 04:54:57 CDT

Dear Sir:
    I have seen many simulation using full- electrostatics method (PME) need add some ions to neutralize the system. I do not know if the system of simulation must be neutral charged.
   Please tell me. what impacts if the system is not charged?
    Best regards
                                 Ma Shaojie

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