The vertical ionization potentials for CH4 and Hz0 are computed using the quasidegencratc many body perturbation method of Brandow in a pti function approximation that neglects nondiagonal hole line diagrams and all the "folded" diagrams. The results obtained for localised orbitals are significantly
Analytic many-body perturbation theory MBPT(4) response properties
β Scribed by G.W. Trucks; E.A. Salter; J. Noga; R.J. Bartlett
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 575 KB
- Volume
- 150
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The full MBPT(4) response density matrix has been derived and implemented. This allows for the analytic determination of MElPT( 4) one-electron properties at a fraction of the cost of traditional numerical calculations. Dipole moments and polarizabilities are compared with full CI results for CH,, F-, and HF. In addition, an extended basis set for H,O is investigated.
π SIMILAR VOLUMES
Explicit spin-orbital equations are presented for the second derivative of the second-order many-body perturbation theory energy based on unrestricted Hartree-Fock reference functions, and their implementation is briefly discussed. Results are reported for the electric polarizabilities, harmonic vib
Equations are derived for the derivatives of the contribution of triple excitations to the energy for the fourth-order many-body perturbation theory (MBPT (4) ), quadratic configuration interaction with singles, doubles, and noniterative triples (QCISD(T ) ), and coupled-cluster with singles, double