What are orbitals?

Some articles on orbital, orbitals:

Solvatochromism - Charge Transfer Bands
... Charge transfer bands (CT) in electronic spectra - Migration of an electron from an orbital that is predominantly metal in character to an orbital that is predominantly ligand in ... and the ligands contain non-bonding electrons (p-orbitals), e.g ... when the metal is in a low oxidation state and the ligands have low-lying acceptor orbitals e.g ...
Localized Molecular Orbitals
... Localized molecular orbitals are molecular orbitals which are concentrated in a limited spatial region of a molecule, for example a specific bond or a lone pair on a specific atom ... They can be used to relate molecular orbital calculations to simple bonding theories, and also to speed up post-Hartree–Fock electronic structure calculations by taking advantage of the local nature of ... Standard ab initio quantum chemistry methods lead to delocalized orbitals which in general extend over an entire molecule and have the symmetry of the molecule ...
Spin Contamination - Open-shell Wave Functions
... the wave function is approximated as a Slater determinant of spin-orbitals ... theory gives rise to different equations for the α and β orbitals ... there are two approaches that can be taken – either to force double occupation of the lowest orbitals by constraining the α and β spatial distributions to be the same (restricted open-shell Hartree–Fock ...
Triplet Oxygen
... occupying two degenerate molecular orbitals ... These orbitals are classified as antibonding, so the O-O bond is weaker than the N-N bond in molecular nitrogen, where all bonding molecular orbitals are filled ...
Slater–Condon Rules - Mathematical Background
... an antisymmetrization operator acting upon a product of N orthonormal spin-orbitals (with r and σ denoting spatial and spin variables), a determinantal wavefunction is ...