title: A supervised fitting approach to force field parametrization with application to the SIBFA polarizable force field.
abstract: A supervised, semiautomated approach to force field parameter fitting is described and applied to the SIBFA polarizable force field. The I-NoLLS interactive, nonlinear least squares fitting program is used as an engine for parameter refinement while keeping parameter values within a physical range. Interactive fitting is shown to avoid many of the stability problems that frequently afflict highly correlated, nonlinear fitting problems occurring in force field parametrizations. The method is used to obtain parameters for the H2O, formamide, and imidazole molecular fragments and their complexes with the Mg(2+) cation. Reference data obtained from ab initio calculations using an auc-cc-pVTZ basis set exploit advances in modern computer hardware to provide a more accurate parametrization of SIBFA than has previously been available.
authors: Department of Chemistry, University of Basel, Klingelbergstr, 80, CH 4056, Switzerland.
authors: Mike
authors: M
authors: Devereux
authors: Nohad
authors: N
authors: Gresh
authors: Jean-Philip
authors: JP
authors: Piquemal
authors: Markus
authors: M
authors: Meuwly
mesh_terms: D003198:Computer Simulation; D005559:Formamides / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008956:Models, Chemical; D014867:Water / Q000737:chemistry
chemical_list: D005559:Formamides; D007093:Imidazoles; D014867:Water; C031066:formamide; C029899:imidazole; D008274:Magnesium
keywords: I-NoLLS; SIBFA; parameter fitting; parametrization; polarizable force field