Abstract
Equations providing the first and second derivatives of a configuration interaction (CI) energy with respect to an external parameter are provided. We assume no restriction on the form of the CI expansion built from molecular orbitals obtained in a multiconfiguration Hartree-Fock (MCHF) calculation. Also, the coupled perturbed multiconfiguration Hartree-Fock formalism is presented for a general MCHF wave function and provides the first order and second order changes of the molecular orbital expansion coefficients with respect to an external parameter.
| Original language | English |
|---|---|
| Pages (from-to) | 5758-5765 |
| Number of pages | 8 |
| Journal | The Journal of Chemical Physics |
| Volume | 74 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1981 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry