Abstract:
The expansion structure of a CI vector as combination of excitations from a model-space reference determinant is investigated. It is shown that between the linear and the exponential expansions there is a relation which is similar to the single-reference case, if the internal excitations are adsorbed into the reference vector. Moreover, expansions with respect to different determinants are related by a set of linear equations. By using these two properties, a State-Specific Coupled-Cluster formalism is proposed.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 2 November 2000 / Received in final form 1st March 2002 Published online 28 June 2002
Rights and permissions
About this article
Cite this article
Evangelisti, S. A multi-reference exponential expansion for the electronic wave function. Eur. Phys. J. D 20, 61–69 (2002). https://doi.org/10.1140/epjd/e2002-00103-6
Issue Date:
DOI: https://doi.org/10.1140/epjd/e2002-00103-6