the question of checking atom vector every step and moliere potenial

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Dear all,

I have two questions about my model (I want to deposit Platinum atoms on graphite with the effect of Argon):

  1. I want to make a judge every steps when Pt atom are reject back from graphite and reach a hight (z(i) > 20.0 metal unit), I can put this atom in a group and reset the velocity, position and force of this group. I don’t know how to do it, for checking vetor of every atoms every steps and sent them to a dynamic group is a big problem for me.
  2. I want to use Moliere potential between Argon with C and Pt, but I check there is not Moliere potential in lammps, so could you give me some suggestion on potential in lammps about this model?

Thanks so much for your great help!
Best wish!

2011-06-16