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Separation of overall translational motion from internal atomic motion; exact for isolated nonrelativistic systems with translation-invariant interactions.
wp-physics-center_of_mass_separationnist-atomic-spectroscopyEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Translation invariance permits separation of overall center-of-mass motion from internal coordinates.
Apply a standard functorial or canonical construction whose output is not merely a reduct of the input and is not generally an equivalent presentation of the same object.
wp-physics-center_of_mass_separationnist-atomic-spectroscopywp-physics-atomic_hamiltonianEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
For a two-body atom the internal kinetic energy uses the exact reduced mass; for many-electron atoms related mass-polarization terms remain.
A more specific theory, model, entity class, or regime is obtained by restricting or extending the scope of a broader framework.
wp-physics-reduced_mass_approximationnist-hydrogenwp-physics-center_of_mass_separationnist-atomic-spectroscopy