Hi Ayman,

though I don't know how to get it using MS, with vmd (Extension-> analysis -> Radial distribution function) you can get it.

Good luck.

Best,

Yan

Thanks Yan,

I don't have this software could you send me it?

Hi Ayman,

Visual Molecular Dynamics is for free and you can download it：

http://www.ks.uiuc.edu/Development/Download/download.cgi?PackageName=VMD