# Wigner D-matrix/Related Articles

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- Euler angles [r]: three rotation angles that describe any rotation of a 3-dimensional object.
^{[e]} - Imaginary number [r]: In mathematics, a complex number whose square is a negative real number, or (sometimes) more generally a non-real complex number.
^{[e]} - Molecular Hamiltonian [r]: Quantum mechanical operator describing the energy associated with motions and interactions of the electrons and nuclei that constitute a molecule.
^{[e]} - Rigid rotor [r]: A 3-dimensional rigid object rotating around its center of mass.
^{[e]} - Slater determinant [r]: A form for the wavefunction of a multi-fermionic system that satisfies anti-symmetry requirements, and consequently the Pauli exclusion principle, by changing sign upon exchange of fermions.
^{[e]} - Spherical harmonics [r]: A series of harmonic basis functions that can be used to describe the boundary of objects with spherical topology.
^{[e]} - Stark effect [r]: The shifting and splitting of spectral lines of atoms and molecules due to the presence of an external static electric field.
^{[e]}