David L. Bostick wrote: > Hi, > > Are there any parameters for the larger halide ions? .. Br-, I-, etc.. > ions.itp doesn't have any. > > Thanks, > David Hi David, OPLS-AA/L includes a couple of them (check ffoplsaa.atp for details, but Br and I are there as opls_402 and opls_403). Cheers, Erik