Chemistry:Hartree product

The Hartree product is a system (many-particle) wavefunction, given as a combination of wavefunctions of the individual particle wavefunctions. It is inherently mean-field (assumes the particles are independent) and is the unsymmetrized version of the Slater determinant ansatz in the Hartree–Fock method.

For two particles,

$\mathrm{\Psi }({\mathbf{𝐱}}_1,{\mathbf{𝐱}}_2)={\chi }_1({\mathbf{𝐱}}_1){\chi }_2({\mathbf{𝐱}}_2).$

This is not satisfactory for fermions, such as electrons, because the resulting wave function is not antisymmetric. An antisymmetric wave function can be mathematically described using the Slater determinant.