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[ESPResSo-users] P3M epsilon

From: Farnoosh Farahpoor
Subject: [ESPResSo-users] P3M epsilon
Date: Mon, 7 Nov 2011 11:46:40 +0330

Dear Espresso developers

I have a question about P3M method. When we use the "inter" command with coulomb interaction we should set the Bjerrum length. This quantity contains all of the information about electrostatic strength in a medium with a specified temperature.
But there is another option in P3M method, "epsilon" (The dielectric constant of the surrounding medium). Why and when we should set this parameter? What does it mean that it "Defaults to metallic."?
When I am simulating a polyelectrolyte in water in the room temperature shall I set it to the reduced magnitude of permittivity of water?

Thank you in advance for your concern
With best regards

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