Affiliation:
1. Laboratoire de Chimie Théorique (LCT), Unité de Chimie-Physique Théorique et Structurale (UCPTS), Département de Chimie, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
Abstract
Abstract
A method for the computation of electronic energies of stereoregular polymers is reviewed,
using a formulation that makes use of Fourier-representation techniques and the Ewald
procedure for accelerating the convergence of lattice sums. That method is in the present
work extended to include the computation of electric polarization at an “uncoupled”
approximation at the level of second-order perturbation theory based on Hartree–Fock wave
functions, using the procedure of Blount and of Genkin and Mednis, as applied to polymers by
Barbier, Delhalle, and André. The extension requires computation of the derivatives of Fock
matrix elements with respect to the Bloch-wave parameter k, and an effficient numerical
procedure for evaluating these derivatives is described here. The computational procedures
are incorporated in the authors' ft-1d program, and the new features of that
program are validated by reexamining the band structures of polyethylene and polysilane. The
results are consistent with the older work on these systems, but exhibit more computational
efficiency and greater achievable accuracy.
Subject
Physical and Theoretical Chemistry
Cited by
1 articles.
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