vdW parameters for Cu(I)

 Dear Netters,
 I am looking for vdW parameters for Cu(I).  These should
 preferably have been developed for the Amber FF, but other
 parameters of the Lennard-Jones type might work as well.
 Is there a straightforward method for calculating vdw
 parameters for transition metals using ab initio or
 DFT techniques?
 Thank you!
 		Tore Brinck
 		Dep. of Chemistry
 		Royal Institute of Technology
 		Stockholm, Sweden
 		tore |-at-| physchem.kth.se