# Rigid rotor/Related Articles

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- Acceleration [r]: The increase of an objects velocity (or speed) per unit time.
^{[e]} - Angular momentum (classical) [r]: The tendency of a rotating object to resist changes to its rotational motion.
^{[e]} - Angular momentum coupling [r]: The procedure of constructing eigenvectors of a system's angular momentum out of angular momentum eigenvectors of its subsystems.
^{[e]} - Classification of rigid rotors [r]: A terminological scheme to classify rigid rotors by the relative size of their principal moments of inertia.
^{[e]} - Eckart conditions [r]: Equations describing the conditions under which the vibrations of molecules can be separated from molecular rotations and translations
^{[e]} - Euler angles [r]: three rotation angles that describe any rotation of a 3-dimensional object.
^{[e]} - Hydrogen [r]: The most abundant and lightest chemical element which has atomic number Z = 1 and chemical symbol H.
^{[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]} - Molecule [r]: An aggregate of two or more atoms in a definite arrangement held together by chemical bonds.
^{[e]} - Right-hand screw rule [r]: Associates the direction of an electric current with the direction of the magnetic force lines encircling the current.
^{[e]} - Schrödinger equation [r]: A differential equation of quantum mechanics, describing the spatial and temporal behavior of wave functions.
^{[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]} - Wavenumber [r]: A wave property inversely related to wavelength, having SI units of reciprocal meters (m−1).
^{[e]} - Wigner D-matrix [r]: matrix in an irreducible representation of the groups SU(2) and SO(3); quantum mechanical symmetric top eigenfunctions.
^{[e]}

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