[MMTK] Forcefield Selection

[Frank Nazare]

Hello,
 
I have difficulty in chosing the right forcefield for my model.  My initial structure is made up of Nickel and Sulphur.  Although I am trying to use the Universal force field, I am not getting the result as expected. 
 
Can anyone suggest a appropriate forcefield for Nickel, Sulphur and Iron.
 
Regards,
 
Frank Nazaré


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