CS correlation functional

The original CS correlation functional was proposed as an electron correlation correction for the Hartree-Fock method in 1975. Assuming that the volume of the region where electrons are excluded (excluded volume) is proportional to Wigner s excluded volume (Wigner 1934 Wigner and Seitz 1933), the following equation... 

A second orbital-dependent expression, originally introduced for use with the Hartree-Fock scheme, is the Colle-Salvetti (CS) correlation functional [23]. The starting point for the derivation of the CS functional is an approximation for the correlated wavefunction F(ricri,... rjvajv). The ansatz for. .. r aA consists of a product of the HF Slater determinant and Jastrow factors,... 

This functional depends on the spin-density and the kinetic energy of spin k(r In the DFT context, this latter dependence makes an implicit functional for which the OPM has to be utilized. Therefore, the CS correlation functional has been suggested as a first candidate for going... 

---