43.11.2 Printing weights of the valence bond structures

For further details regarding the calculation of weights in CASVB, see T. Thorsteinsson and D. L. Cooper, J. Math. Chem. 23, 105-26 (1998).


Calculates and outputs weights of the structures in the valence bond wavefunction $\Psi_{VB}$. key specifies the definition of nonorthogonal weights to be used, and can be one of:

Evaluates Chirgwin-Coulson weights (see: B. H. Chirgwin and C. A. Coulson, Proc. Roy. Soc. Lond. A201, 196 (1950)).
Performs a symmetric orthogonalization of the structures and outputs the corresponding weights.
Outputs “inverse overlap populations" as in G. A. Gallup and J. M. Norbeck, Chem. Phys. Lett. 21, 495-500 (1973).
All of the above.
Suspends calculation of structure weights.
The commands LOWDIN and INVERSE require the overlap matrix between valence bond structures, and some computational overhead is thus involved.

molpro@molpro.net 2018-12-13