vdw value in parameter file

From: Ӵ (yonghunihao_at_163.com)
Date: Mon Jun 20 2011 - 02:26:06 CDT

Hi everyone,
 My system include two kind of metal ions: strontium and nickle. I need the vdw value of them, i.e. epsilon and Rmin.
The existing parameter file include some familiar ions, chloridion,calcium, potass,sodium etc. But, for a unfamiliar ion , how can we establish the vdw parameter of it ?
I look for the methord for a long time , any answer will be appreciated!

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