Ab-initio COUPLING COEFFICIENTS BETWEEN THE LOWEST IONIC AND COVALENT STATES OF $KBr_{2}$
Loading...
Date
1984
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
We will present results of an ab-initio MCSCF/CI study of the curve crossing region for linear $KBr_{2}$. The calculations were performed with effective core $potentials^{1}$ for both Br and $K^{2}$ and a valence double zeta plus polarization basis set. A single set of MCSCF orbitals was used to perform the Cl; the configuration list included up to quadruple excitations from a multireference set. The distance between K and the center of mass of $Br_{2}$ was fixed at 15 a. u. which places the system in the region where a vibrational barrier has been postulated. The barrier has been found in a DIM $calculation^{3}$. We have also calculated coupling matrix elements between the diabatic ionic and covalent states. We shall report energies and matrix elements and compare them with estimates obtained from semiempirical $models^{3,4}$.
Description
$^{1}$.- P.J. Hay, W.R. Wadt and L.R. Kahn, J. Chem. Phys. v68, 3059 (1978) $^{2}$.- W.R. Wadt, private communication $^{3}$.- E.M. Goldfield, E.A. Gislason and N.H. Sabelli, submitted for publication $^{4}$.- R. Grice and D.R. Herschbach, Mol. Phys., 27, 159 (1974)
Author Institution: Department of Chemistry, University of Illinois at Chicago
Author Institution: Department of Chemistry, University of Illinois at Chicago