On 7/25/14, 8:21 AM, #SUKRITI GUPTA# wrote:
Dear Justin, Thanks for your reply. Then it there any relation between charge density (for same element) and lj parameters e.g. for higher charge vander waals radius is smaller? Or are lj parameters randomly selected just to satisfy physical behavior of the ions?
There's nothing random about it. You need some sort of target data - QM interaction energies, crystal geometries, hydration free energies, etc. to parametrize the model. The parameters are tuned to agree with whatever data are deemed suitable. Additive models of transition metals are generally very poor, though. There are many effects that simply can't be captured by a point charge with a 12-6 LJ potential.
-Justin -- ================================================== Justin A. Lemkul, Ph.D. Ruth L. Kirschstein NRSA Postdoctoral Fellow Department of Pharmaceutical Sciences School of Pharmacy Health Sciences Facility II, Room 601 University of Maryland, Baltimore 20 Penn St. Baltimore, MD 21201 jalem...@outerbanks.umaryland.edu | (410) 706-7441 http://mackerell.umaryland.edu/~jalemkul ================================================== -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.
