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Hello Dan--

> Does any of you know a value for Fe or ZN atoms for MD simulations?
> Is there a reference for that issue.


CNS lists parameters for single atom species as:

NONBonded  FE     0.01  2.270     0.01  2.270
NONBonded  ZN     0.01  2.484     0.01  2.484
{- from: Teatum, Gschneider & Waber. (1960) Compilation of calculated data
         useful in predicting metallurgical behaviour of the elements in
         binary alloy systems, LE-2345, Los Alamos Scientific Laboratory -}

NONBonded  FE+2   0.01  1.336     0.01  1.336
NONBonded  FE+3   0.01  1.229     0.01  1.229
NONBonded  ZN+2   0.01  1.568     0.01  1.568
{- from: Shannon (1976) Revised effective ionic radii in halides and
         chalcogenides, Acta Cryst. A32, 751. -}


you might also use the charmm22 parameters. 

best regards--
Charles
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