[gmx-users] How to use different potential interaction in gromacs

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Dear Everyone,
 
I want to simulate the Au (gold) nanoparticle and DNA single strands in a liquid.
 
But the interaction potential of Au- H2O is very different from the style which gromacs uses.
 
U = D[exp(-2a(r - r0)) - 2 exp(a(r - r0))]
 
How can I do if I want to use this potential in gromacs.
 
Thank you very much !!!
 
 
Wen-Peng Qi
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