# Molecular Hamiltonian/Related Articles

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- Atomic number [r]: The number of protons in the nucleus of a single atom of a chemical element.
^{[e]} - Born-Oppenheimer approximation [r]: A technique in quantum mechanics in which the kinetic energies of nuclei and electrons are calculated separately.
^{[e]} - Eckart conditions [r]: Equations describing the conditions under which the vibrations of molecules can be separated from molecular rotations and translations
^{[e]} - GF method [r]: Method to compute the normal coordinates of a vibrating molecule.
^{[e]} - Intermolecular forces [r]: Non-covalent forces between atoms and molecules; often synonymous with Van der Waals forces.
^{[e]} - Molecular orbital theory [r]: Deals with definition and computation of molecular orbitals.
^{[e]} - Quantum chemistry [r]: A branch of theoretical chemistry, which applies quantum mechanics and quantum field theory to address issues and problems in chemistry.
^{[e]} - Schrödinger equation [r]: A differential equation of quantum mechanics, describing the spatial and temporal behavior of wave functions.
^{[e]} - Self-adjoint operator [r]: Linear operator which is identical with its adjoint operator.
^{[e]} - Wigner D-matrix [r]: matrix in an irreducible representation of the groups SU(2) and SO(3); quantum mechanical symmetric top eigenfunctions.
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