Definition
The electronic density corresponding to a normalized N-electron wavefunction (with r and s denoting spatial and spin variables respectively) is defined as
where the operator corresponding to the density observable is
In Hartree-Fock and density functional theories the wave function is typically represented as a single Slater determinant constructed from N orbitals, φk, with corresponding occupations nk. In these situations the density simplifies to
Read more about this topic: Electronic Density
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