[gmx-users] Is there force field for the heavy ions?

[G.H. Zuo]

Dear Gromacs users

I want do some studies about the As and Sn. But I can't found them in the
regular force field, including
oplsaa and amber.  How can I get the parameters for these ions? Or there are
some method to obtain
these parameters?

Thanks!

G.H.Zuo
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