For LJ interactions, use [ pairtypes ]. For Coulombics there is unfortunately no analogous solution. I am not clear about exactly what you want to do. What "parameters" are you interested in, or by this do you just mean LJ and Q?

Chris.

-- original message --

Hello,
I was wondering how to set up parameters for interactions between two different atoms A and B. Since for Gromacs parameters are defined to each kind of atom, I cannot specify parameters between A and B. For Buckingham potential, the rule was:
   A_ij=(A_ii * A_jj)^(1/2)
So anyone know how to specify this value while not using the combination rules?
--snip--


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