Hi all, I use PME to simulate an ion solvated in water to study the hydration free energies. Hence typically I let my system be charged. I understand that PME uses a correction term to account for the charged system; but I do not know how exactly it is done. Can anyone please help me find a reference probably where the correction is explained... ( I think, in EWALD summation an equal background compensating charge is distributed...) Thanks in advance Sowmi Rajamani Graduate STudent Rensselaer Polytechnic Institute 110 8th Street Troy NY 12180