Open-shell systems Configuration interactions 4 Electron systems 4 Expectation values 4 Hartree-fock 4 Wave functions 4 Atomic orbitals 2 Basis sets 2 Carrier concentration 2 Charge concentration 2 Chemical bondings 2 Chemical bonds 2 Chemistry 2 Density functional theory 2 Depletion region 2 Eigenvalues 2 Eigenvalues and eigenfunctions 2 Electric charge 2 Electron densities 2 Electron density measurement 2 Electronic spins 2 Electrons 2 Field concentrations 2 Fuzzy atoms 2 Information concerning 2 Lewis model 2 Local spin 2 Local spins 2 Matrix extension 2 Molecular reactivity 2